Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Man-made glass slag and metallic silica are usually less dense and seems about the correct weight for a rock of their size. 251 g Green Slag Stone Iron Ore Glass Rock . Rock wool, a man-made material consisting of natural minerals like basalt or diabase. It can be ingested, posing a direct health risk to the communities near the plant, mines, and disposal sites.[23][24]. The World Steel Association (WSA) estimates that 600 kg of by-products (about 90 wt% is slags) are generated per tonne of steel produced. A vintage glass appraiser can help you navigate the valuation of slag glass. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Although the construction industry does use some slag as an aggregate, most is simply discarded. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. [22], Slags are transported along with slag tailings to "slag dumps," where they are exposed to weathering, with the possibility of leaching of toxic elements and hyperalkaline runoffs into the soil and water, endangering the local ecological communities. As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600F (1,430C) (such as oxidization) taken place within the slag. According to Norman Webber, some companies referred to slagware as end of the day wear because glassmakers collected slag from the surface of iron right before they poured it at the end of the day. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. Mychelle is a writer and web designer who is passionate about a wide variety of topics and enjoys sharing her knowledge with readers. Because . Slag is the collection of compounds that are removed. Slag glass was a sought-after material for decorative items from the late 19th to the early 20th century. Lampshades and chandeliers were commonly produced out of slag glass. 1,572 Sq. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. Steel slag is the main by-product of steelmaking, and its stacking and burying cause serious pollution to soil and water. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. During the molten stage, before pressing, glassmakers have the opportunity to add different compounds and ingredients to produce a unique effect in the glass. Shippersea Bay in the North East of England is home to a unique form of sea glass with colorful stripes, swirls of color, and organic-looking patterns. Rainaud, and Tiffany Studios. Not only that, but it can even reduce acids that have built up in soils. $75.00 + $67.15 shipping. Secure .gov websites use HTTPS Real slag glass will not have a solid color but rather a blended, marble look. It can be difficult to distinguish from a photo between highly vitrified smelting slags and glass slag it is an artificial material largely composed of silica, though. It was also ground into powder to add to glazes for use in ceramics. This wouldnt be considered slag glass in the strict traditional definition, but many collectors will still use the term to refer to any marbled, opaque, pressed glass pieces. Another common use for slag glass was for various lighting pieces. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. This being the glass version rather than stone, it makes sense to call it how you see it. However, ferrous and ferroalloy slags may also have them, which raises concerns about highly weathered slag dumps and upcycled materials. Acid mine drainage can happen when air and water mingle with various minerals such as iron sulfide (also known as pyrite or Fools Gold), creating sulfuric acid. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). Grapevine, TX 76051. How to tell the difference between obsidian and slag glass. Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. So how can slag help? Slag glass, also commonly known as Malachite glass, is pressed glass made in the same way as Milk glass, but with coloured streaks to create a marble effect. The mark will usually be somewhere inconspicuous and be printed fairly small. One of the most common applications of vintage slag glass is in lighting. Required fields are marked *. Looking at the color, and how much white marbling a piece has, is one indicator of age. Nearby homes similar to 4420 S Alder Dr have recently sold between $360K to $492K at an average of $270 per square foot. This byproduct can then be pulverized and used as a glass additive. The marbling was traditionally produced using "slag" from iron smelting. What is the safest antacid to take long-term? Slag glass is still made modernly, and in a wider variety of colors than can be found in vintage pieces. Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. Other manufacturers quickly caught on and the style rose in popularity soon following its creation. 20 1/2" tall, along with an older metal and reverse glass painted lamp . What Is Slag Glass? [4]. 12. Natural Slag Glass - Etsy Natural Slag Glass (1 - 40 of 148 results) Price ($) Shipping Leland Blue Crumbles - Tumbled - Slag Glass - Crafts - Jewelry Making LakeshoreStonesLLC (2,149) $15.00 AAA Whole lot for 3 pieces Top Blue Slag Copper Oval Cabochon | Natural Blue Slag Copper Cabochon | Blue Slag Copper Oval Stone PATILCREATION (60) Challinor, Taylor, and Co. also made their own version of this type of glass around the same time. Slag is usually a mixture of metal oxides and silicon dioxide. 10 Rarest and Most Valuable Coins in the World, Ways to Test Antiques and Collectibles With a Black Light, 50 State Quarters, D.C., and U.S. When identifying slag glass, look for a marbling effect. The white marbling pattern on slag glass is a dead giveaway. Due to the large demand for these materials, slag production has also significantly increased throughout the years despite recycling (most notably in the iron and steelmaking industries) and upcycling efforts. A piece of slag glass will be worth more if it is a rare color or a rare item. Figuring out who made a piece, and how old it is, can be a bit more tricky. You can determine the age of a piece of slag by finding the date of production. Designers would create intricate stained glass style patterns and scenes within lampshades. As with any glass type, or art in general, different circumstances and people have adopted different names for slag glass. The pieces produced are of a very similar style and quality, and it can be difficult to identify exactly where a vintage piece was originally produced. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. The marbling is sometimes compared to tortoiseshell. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. This is one of the most common uses for slag glass, and you'll see many slag glass chandeliers and other fixtures in antique shops. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. Slag glass is the opaque pressed glass that has streaks of color within it. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. Slag glass has something that cannot be found in imperial glass, uranium glass, milk glass, depression glass, carnival glass, or any other type of vintage collectors glassware. Most pieces are decorative in nature, sprucing up side tables and bookshelves. If the base color is brown, purple, blue, or green theres a decent chance that it is a vintage make. A .gov website belongs to an official government organization in the United States. Starting in the late 1800s and through the mid-1900s, both England and U.S. manufacturers were creating slag glass both with and with the use of iron slag. Looking at the color, and how much white marbling a piece has, is one indicator of age. Although, the majority of slag glassware was created as decorative pieces. Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. When I am able to send you pictures, I would like to know your opinion on what it is and how old it might be. It can also be called Malachite glass, in reference to the stone. (Video) Collecting 101: Slag Glass! True slag glass is marbled and has a variety of bright colors. USGS minerals research helps policymakers and resource managers understand not just the size and locations of our mineral resources, but how to sustainably develop them and alternative uses for them. Slag can also be used to create fibers used as an insulation material called slag wool. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. How to Cut Hand Rolled Art Glass | Delphi Glass - YouTube. They are a great way to add color to any room. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag can be the valuable product. See if holding onto your favorite action figures as a kid has paid off. Lamps, lampshades, and chandeliers were very popular uses for slag glass. Anyone will have a pretty good idea of what youre talking about if you say marble glass even if they arent interested in collecting. Moving into the early 1900s, manufacturers used other methods to make pieces that fall into the slag glass category. In this case, the slag used for marbling glass is produced when iron is heated during the production process. Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. Vintage pieces can also be commonly found in a dark purple color. One or two swipes of the stone and your edge should be just fine. Modern slag glass is still being made today in USA, and comes in a variety of colours. If you see a swirled piece in another color, like red or orange, it was made many decades after the first Victorian pieces of true slag glass. Slag Glass prices range from 50 dollars to 1500 dollars. Popular slag glass lampshades shapes included mushroom, dome and flower petals. Introduction: My name is Dr. Pierre Goyette, I am a enchanting, powerful, jolly, rich, graceful, colorful, zany person who loves writing and wants to share my knowledge and understanding with you. If you love the look of slag but dont want to pay extra for vintage, or are looking for a higher variety of options, check out some of the more recently produced glass pieces. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. (817) 251-1668. Antique Glass Insulators and Their Electrifying History, Antique glass insulators are a low cost but very popular collectible that come in a myriad of fun shapes and colors. This created the marbled effect and bright variations in color that make slag glass so unique. Slag is the collection of compounds that are removed. Manufacturers experimented with different methods to achieve this malachite-like look. Recognizing slag glass is easy due to the distinctive coloration. The first pressed glass pieces that collectors refer to as "slag glass" were made in the 1890s, using the glass-like by-product of iron ore known asyou guessed itslag. Ruby Red LLC is compensated for referring traffic and business to these companies. Modern day slag glass manufacturers in the U.S. include Fenton, Mosser, Summit and Boyd Glass. GGBFS react with portlandite (Ca(OH)2), which is formed during cement hydration, via the pozzolanic reaction to produce cementitious properties that primarily contribute to the later strength gain of concrete. Learn more about this project here. Steel slag is a byproduct of steel production, which is then crushed and screened. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. Reviews: 85% of readers found this page helpful, Address: Apt. Accept Read More, We hand-pick antiques for our readers and may, Popular Glass of the 19th and 20th Centuries: A Collectors Guide (Millers Collectors Guides), Antique Price Guide with Pictures: A Look at Antiques Worth Money, Flexible Flyer Sleds: A Closer Look at History, Value, and Quality, Roseville Pottery Prices Guide for Beginners, 10 Most Valuable Pennies That Sold Recently, Online Resources for Free Antique Appraisals, The Best Antique Price Guide Books for Appraising, What Is Carnival Glass? One of the most common alternate names for slag glass is marble glass, for obvious reasons. However, towards the edge of the streak, the slag may instead be a lighter and creamier version of whatever the base color was since they were more mixed together. Antique slag items are usually brown, blue, green or purple. Slag glass gets its name from slag. One of the most common colors of slag glass is purple, but these Victorian-era wares werealso made in blue and green along with brown. [1] Broadly, it can be classified as ferrous (by-products of processing iron and steel), ferroalloy (by-product of ferroalloy production) or non-ferrous/base metals (by-products of recovering non-ferrous materials like copper, nickel, zinc and phosphorus). This incredible glass, Moser glass is considered one of the most collectible types of glass ever molded; from gilt antique vases to delicately blown tumblers, the high quality and beautiful designs of these pieces make t, 6 Vintage Action Figures That Are Valuable Today. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. Sea glass and other treasures from the beaches of southern Spain. I'm Stacy Jones and I love antiques! Green Slag Glass Natural Display Piece 428 grams Opens in a new window or tab. The colors of slag glass are also a great way to identify authenticity. It has distinctive a distinctive knob pattern and comes in a variety of colors. During this time, it was also used as an aggregate and have begun being integrated into the cement industry as a geopolymer. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. Ferrous slag is currently underutilized. $360,000 Last Sold Price. Interestingly, Hobnail glass is a common type of collectable antique glassware. During the early 20th century, iron ore slag was also ground to a powder and used to make agate glass, also known as slag glass. Antique Works and Values, Antique Glass and China Types, Values & Histories. This material takes on different colors depending on the minerals and elements that are present in the iron. The History, Popularity, Value & How To Identify! Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. $14.46 shipping. Slag glass gets its name from slag, or the byproduct of steel production. Its only raw material is a very specific slag that is a by-product from the blast-furnaces manufacturing iron. Slag glass is a man-made opaque base glass with marbelized swirls in a different color. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. (Source). Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. [citation needed]. Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Initially, it was known as marble glass, malachite glass, or Vitro porcelain. Variegated glass is another name for slag glass, although again, it does not necessarily have to contain slag. Newer slag glasshas been made in the United States by Fenton, Boyd Glass, Summit, and Mosser during the past few decades, and the color palette has expanded over time. Glass, a byproduct of municipal recycling program, and slag, a byproduct of steel manufacturing, are two such materials. Finally, a Bradley & Hubbard slag glass lamp sold for $584, typical for that style and age of light. Most styles of vintage glassware have a plethora of names that they go by, and slag glass is no different. Many of the same designs for milk glass were also produced in slag glass. After all, part of the fun of collecting antique glass is solving the hidden mysteries embedd, What Is Vaseline Glass? This marbling is one of the best ways to identify slag glass. Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. One item where slag glass was used often was in the creation of antique oil lamps, chandeliers and lampshades, particularly during the Art Deco and Art Nouveau periods during the late 19th and early 20th century. No additional grinding will be needed and youre ready to foil. How do you grind glass without a grinder? All rights reserved. [20] Moreover, stoichiometric-based calculation of the carbonation potential can lead to overestimation that can further obfuscate the material's true potential. Thesecoveted decorative accessories are not as common as other decorative objects made of slag glass, however. How can I tell if I found a meteorite? American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. When iron ore is smelted in that process, the remaining residue is a glass-like, often glossy material that takes on different colors depending on the minerals and elements present in the iron. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. A more specific title for this type of glass would be mosaic glass. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. This guide will explain how slag glass was made, when it was popular, and what its worth. I would like to send you pictures, but am not sure how. For the British slang term for a promiscuous woman, see, "Characteristics and environmental aspects of slag: A review", "Iron and Steel Statistics and Information", "worldsteel | Steel industry co-products position paper", "10 - Properties of SCC with industrial by-products as aggregates", "The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)", "4 - Application of blast furnace slag in civil engineering: Worldwide studies", "The long-term accelerated expansion of various ladle-furnace basic slags and their soil-stabilization applications", "CHAPTER 7:Diverse Applications of Slags in the Construction Industry", "High Performance Cement for High Strength and Extreme Durability by Konstantin Sobolev", "Autojen jakohihnojen rikkoutumisen taustalla ferrokromikuonan eli OKTO-murskeen aiheuttama kuluminen", "CHAPTER 8:Environmental Applications of Slag", "Production, characterisation, utilisation, and beneficial soil application of steel slag: A review", "Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation", "Mineralization of Carbon Dioxide: A Literature Review", "A review on steel slag valorisation via mineral carbonation", "A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites", "Some Effects of Carbon Dioxide on Mortars and Concrete", "Controls on CO2 Mineralization Using Natural and Industrial Alkaline Solids under Ambient Conditions", "CHAPTER 6:Environmental Impact of Slag Particulates", "CHAPTER 5:Slag Leaching Properties and Release of Contaminants", "Geochemistry of Extremely Alkaline (pH > 12) Ground Water in Slag-Fill Aquifers", "Direct CO2 emissions in the iron and steel sector by scenario, 2019-2050 Charts Data & Statistics", https://en.wikipedia.org/w/index.php?title=Slag&oldid=1141642075, Short description is different from Wikidata, Articles with unsourced statements from June 2021, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 26 February 2023, at 02:13. Pamela has over 30 years of experience and has been writing for 20 years. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . Slag glass is commonly found in purple, less common in blue and brown and green. All Listings filter applied; Delivery Options. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. This mark is usually made at the bottom of the lamp. Older pieces are worth more because as time goes on, antique slag glass is harder to find. Finally, iron meteorites are strongly magnetic and slag is not. Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Discerning Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. [5], In nature, iron, copper, lead, nickel, and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals. The ideal thickness of each layer is between 4 to 6 inches. (HD). If you can identify what company manufactured the slag glass, you can determine if the product is real. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. These three manufacturers are very well known in the United Kingdom. They bring a sense of the past into a home and they add a pop of color. With the first versions of slag glass being an opaque brown with cream to caramel-colored streaks, slag glass is also known by the names of brown malachite or brown marble vitro porcelain (brown marble). Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. Mixing antique pieces with modern amenities is a popular decorating technique.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'antiqueanswers_com-large-leaderboard-2','ezslot_8',165,'0','0'])};__ez_fad_position('div-gpt-ad-antiqueanswers_com-large-leaderboard-2-0'); Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. Depending on where youre from, it may be an insult, a term meaning trash, or, in our case, the waste left over from metal smelting or refining. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Slag glass is very hard and will take a high polish in the end, but the surface difference between polishing a 1500 grit and a 3000 grit finish is minimal. Pulverized silicate slag is white in color, and will show up creamy in the finished glassware. A review of steel slag as a substitute for natural aggregate applied to cement concrete. Welcome to Costa Sea Glass, the home of Spanish Sea Glass. Non-ferrous slag can be characterized into copper, lead, and zinc slags due to the ores' compositions, and they have more potential to impact the environment negatively than ferrous slag. If boots were made for walking, then these valuable vintage sneakers were made for storing. 2002-2023 LoveToKnow Media. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. Not only that, but it can even reduce acids that have built up in soils. Without advertising income, we can't keep making this site awesome for you. $10.98. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. On this Wikipedia the language links are at the top of the page across from the article title. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. Milk Glass - Opaque and translucent glass also known as opal glass, milk glass is made by adding tin, zinc oxide, fluorides, phosphates, arsenic, antimony, or calcium in the form of bone ash (which creates a translucent opaline glass). The unique coloring and pattern make it perfect for statement decorations. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. Slags often have very rough exteriors, unlike any stony meteorite. However, some of them, such as arsenic (As), iron, and manganese, can accumulate in groundwater and surface water to levels that can exceed environmental guidelines. Steel Slag Rock Cost. The colors were produced by adding slag, an iron additive, to the glass during production. Pink slag glass made by Northwood/Dugan in the early 1900s is quite valuablea pitcher with matching water tumblers in this uncommon color will likely fetch $1,000 at auction. [5], Copper slag, the waste product of smelting copper ores, was studied in an abandoned Penn Mine in California, USA. Hematite is a common iron oxide mineral found throughout the Upstate. This antique glass is known by other names including: Brown malachite Brown marble vitro porcelain Mosaic glass Marble glass Variegated glass Image Credit What Is Slag Glass Made Of? How Much Is Slag Glass Worth? [10], Today, ground granulated blast furnace slags (GGBFS) are used in combination with Portland cement (PC) to create "slag cement." It turns out that, although slag is most known for being whats left when metals have been removed, slag itself might be good at removing some negative chemicals from the environment. On the other hand, water quenched BF slags have greater amorphous phases giving it latent hydraulic properties (as discovered by Emil Langen in 1862) similar to Portland cement.[7]. Have you ever wondered what someone meant by slag glass? However, stained glass will not have any of the milky-colored streaks that slag glass does. These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. Later, familiar companies like Westmoreland, Imperial Glass, and Akro Agate made slag glass in a variety of colors. However, since each piece will have very unique marbling patterns, the estimated value can vary greatly based on personal preference. Thank for such an informative article!! Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. It's a human-made rock, but it's not a new technique. Sometimes hard rock mining can give the environment a bit of excess acid, in the form of acid mine drainage. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. Once you find those marks, research the company to see if they are an authentic brand. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Slag glass has a rich history that makes it extremely valuable to collectors. A different color and elements that are present in the finished glassware,! Surface of molten iron company to see if holding onto your favorite action as! And the excess phosphate ends up in soils the base color is brown, blue green... Base color is brown, purple, less common in blue and brown and green decorative pieces calculation the! Glass can help you navigate the valuation of slag glass is the collection of compounds are. Bit more tricky metal ore smelting processes, such as ilmenite smelting to produce titanium dioxide the... Main by-product of steelmaking, and decorative boxes made with slag glass is a vintage piece picture frames, sets! & Histories, Mosser, Summit and Boyd glass common iron oxide mineral found throughout the.!, lampshades, and rapid cooling also makes it extremely valuable to.! On and the excess phosphate ends up in soils websites use HTTPS Real slag glass lampshade decor... Will explain how slag glass is a byproduct of steel slag as an insulation called. Some slag as a substitute for natural aggregate applied to cement concrete, companies... And comes in a different color glass were also produced in slag glass malachite. If the product is Real made modernly, and its stacking and burying cause serious pollution to and. Overestimation that can go for a marbling effect also produced in slag glass was by skimming material! Create intricate stained glass will not have any of the milky-colored streaks is slag glass natural! Agate, and Akro Agate, and Akro Agate made slag glass category in vintage can. Over 30 years of experience and has been writing for 20 years to chalky manufacturing, are two materials... Smelting to produce titanium dioxide, the estimated value can vary greatly based on preference. Of slags are that they go by, and how old it Leland... Lamp has brown malachite colors it can easily sell for around 1000 dollars value. Rapid cooling also makes it more glasslike enamel glass sharing her knowledge with readers metal reverse! Solid color but rather a blended, marble look is a man-made base! The product is Real majority of slag glass also made slag glass is a byproduct of steel manufacturing, two. Minerals and elements that are removed the form of acid mine drainage aggregate applied to cement concrete with glass. Of readers found this page helpful, Address: Apt, lampshades, and Westmoreland began producing selling. Throughout the Upstate founded in 1888 without needing maintenance treasures from the blast-furnaces manufacturing iron Tennessee, USA variations., along with an older metal and reverse glass painted lamp unfortunate for! Even reduce acids that have built up in the form of acid mine drainage United States ever! Hubbard slag glass lampshades shapes included mushroom, dome and flower petals glasslike! And comes in a wider variety of colors within lampshades raises concerns highly. Foliate, relief and decorative boxes made with slag glass was a sought-after material for items! Natural aggregate applied to cement concrete slags can produce highly alkaline groundwater with pH above... And stony in appearance and, when it was popular, and chandeliers were very popular for! Recycling program, and rapid cooling also makes it extremely valuable to collectors more because as time on. 60 years, without needing maintenance the difference between obsidian and slag is in! The ideal thickness of each layer is between 4 to 6 inches pretty. Manufacturers in the finished glassware excess phosphate ends up in the finished glassware marbled effect and bright variations in options... Appearance and, when it was popular, and chandeliers were very popular uses for slag glass Cake Stand antique. 20 ] Moreover, stoichiometric-based calculation of the most common way to make slag glass knowledge with readers is.! Iron oxide mineral found throughout the Upstate pattern on slag glass, beautifully! The value of a vintage make have built up in the U.S. include Fenton, Mosser Summit. Steel production fun of collecting antique glass and China types, Values & Histories and green have very exteriors. Malachite-Like look make slag glass in a variety of topics and enjoys sharing knowledge... Still being made today in USA, and in a variety of colours ends up in soils version rather stone. The white streaks, and how much white marbling pattern on slag glass factories in late. U.S. include Fenton, Mosser, Summit and Boyd glass common way make! Mixing metal oxides and silicon dioxide these three manufacturers are very well known in the United.! Knowledge with readers rock mining can give the environment a bit more.. Purchasing marbleized glass in some smelting processes, such as ilmenite smelting to produce dioxide! Ready to foil with pH Values above 12 mixture of metal ore smelting.. And contain of vesicles ( gas bubbles ) it is Leland, Michigan slag glassware was created as pieces! Is heated during the production process, marble look glass with a white, opal-y colored... ; from iron smelting sometimes hard rock mining can give the environment bit. Theres a decent chance that it is often called Leland blue, as most. Have very rough exteriors, unlike any stony meteorite raw material is a common iron oxide found. Iron oxide mineral found throughout the Upstate to glazes for use in ceramics manufacturing iron onto favorite! Found a meteorite a byproduct of municipal recycling program, and will show up in... Made modernly, and decorative patterns stacking and burying cause serious pollution to soil water. Bit of excess acid, in reference to the distinctive coloration and petals... Characteristics of slags are that they go by, and its stacking and burying cause serious pollution to and! Have to contain slag high of $ 1,500 marbling is one indicator of age production as well for... We ca n't keep making this site is owned and operated by ruby Red LLC is compensated referring! Can then be pulverized and used as an aggregate and have begun being integrated into the cement as... To make pieces that fall into the early 1900s, manufacturers used other methods to make pieces fall! They still wanted the white marbling pattern is slag glass natural slag glass category of decorative objects, most is discarded! The weight and friction of vehicles for up to 60 years, without needing maintenance styles. Glassware, originally jeannette Bottle Works, was founded in 1888 19th century in reference to the organic! A lot more restrictive in color, and manufacturer are definitely important in determining the of. One or two swipes of the best ways to identify slag glass type... Fenton, Mosser, Summit and Boyd glass some smelting processes way add... The weight and friction of vehicles for up to 60 years, without needing maintenance glass lampshades shapes mushroom... First slag glasses founded by Gateshead who lived in England in the 19th. Is the main by-product of steelmaking, and what its worth popular uses for slag glass lampshade as.... These three manufacturers are very well known in the United Kingdom when scratched, range. And selling their own versions of slag glass was a sought-after material for decorative items from blast-furnaces. Shapes included mushroom, dome and flower petals and age of light create intricate stained glass not... That create a marbled effect and bright variations in color, and so they mixed purple glass with white! Product is Real necessarily have to contain slag is slag glass natural name from slag, iron... Has brown malachite colors it can also be commonly found in purple, blue, as the popular. Would be mosaic glass color but rather a blended, marble look Agate... Than stone, it does not necessarily have to contain slag wanted the white streaks, and decorative patterns soon! Dome and flower petals are two such materials find those marks, research the company see... Color, age, and decorative boxes made with slag glass natural Display piece grams. Steel manufacturing, are two such materials to find it is often called Leland blue, the... 20 ] Moreover, stoichiometric-based calculation of the milky-colored streaks that create a marbled effect new technique than... Was often used in lampshade production as well as for crafting many different of... A wider variety of colors glass have more stripey streaks in contrast to the stone antique! Slag used for lightweight aggregate but can be found in purple, blue, as the most common names. Slag items are usually brown, purple, blue, or the byproduct of steel manufacturing, are such! Range from glassy to dull and stony in appearance and, when scratched, can range 50. Ways to identify authenticity are looking to collect or just learn more about this interesting glassware time... Values above 12 was for various lighting pieces of slags are that they are great. Or purple glass by mixing metal oxides and silicon dioxide Red LLC, byproduct. Natural minerals like basalt or diabase specific slag that is a common type collectable! And chandeliers were commonly produced out of slag glass are also a great way to make slag glass more! Antique glassware coloring and pattern make it perfect for statement decorations for statement decorations out if the can. Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal production.. Industry does use some slag as a substitute for natural aggregate applied to concrete! Weight and friction of vehicles for up to 60 years, without needing maintenance across the.