Stone Shop, InSpyritMetaphysical (5,660) $2.50 Vintage Boyd Blue Slag Glass Elephant Head Toothpick Matchstick Holder, Elephant Lovers, Vintage Blue & White Slag Glass HoosierGirlTreasures (83) It is hard and more durable than even the hardest metals. Check the bottom or inside of an item for either a name or logo of a manufacturer. I'm Stacy Jones and I love antiques! Manufacturers usually make slag glass by mixing this silicate slag with clear glass. Many of the same designs for milk glass were also produced in slag glass. Sea glass and other treasures from the beaches of southern Spain. Manufacturers experimented with different methods to achieve this malachite-like look. Share sensitive information only on official, secure websites. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. Thanks Virginia. The highlights were often blue, turquoise, orange, brown, purple, and near black. Outside of the construction industry, it might seem that uses for slag are considered limited. So how can slag help? The light shining through the marbled color creates a really unique effect. Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. Unlike any other type of glass, slag glass is not transparent. Sources/Usage: Some content may have restrictions. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. How to tell the difference between obsidian and slag glass. This being the glass version rather than stone, it makes sense to call it how you see it. Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. Discerning Victorian consumers resisted purchasing marbleized glass in some cases and preferred more decorative elements in crystal. SOLD FEB 14, 2023. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. All rights reserved. This is great! For example, simple things like a bowl sold for around $20 apiece. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. 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. This color pattern led to the "brown malachite" and "brown marble" names. Sellers with highest buyer ratings; Steel slag is a byproduct of steel production, which is then crushed and screened. One or two swipes of the stone and your edge should be just fine. Brown malachite slag glass pieces are the rarest and most coveted colors of slag glass. [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). New Listing Vintage Tulip Slag Glass 10 Panel Lamp Shade Swag Hanging Green caramel MCM Opens in a new window or tab. $360,000 Last Sold Price. 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. 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. It may also have higher free CaO and MgO content, which are often converted to its hydrated forms if excessive volume expansions are not desired. During the process of smelting iron, ferrous slag is created, but dominated by calcium and silicon compositions. We looked specifically at ferrous slag, the leftover material from the smelting of iron and steel, in the Chicago-Gary area of Illinois and Indiana. Here's an example of a Radium-painted watch hand in a cloud chamber. [4]. A review of steel slag as a substitute for natural aggregate applied to cement concrete. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. Hematite is a common iron oxide mineral found throughout the Upstate. Slag glass is no longer produced as it once was. 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]. "Glass slag is similar to obsidian; it, too, consists mainly of silica dioxide. A mark for Sowerby, Davidson, or Greeners will indicate a vintage U.K. piece while a mark from Challinor Taylor and Co., Akro Agate, Westmoreland, or Northwood Glass Company indicates vintage U.S. glass. SOLD FEB 10, 2023. Steel slag is not just good for driveways, it is also used by homeowners as a landscaping stone in back yards around a pool area or patio. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. [23][24], Dissolution of slags can produce highly alkaline groundwater with pH values above 12. Glass, a byproduct of municipal recycling program, and slag, a byproduct of steel manufacturing, are two such materials. Sowerby was a popular producer of this blackberries and cream slag look. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Interestingly, Hobnail glass is a common type of collectable antique glassware. How do you identify glass slag rocks? (817) 251-1668. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. [8], During the Bronze Age of the Mediterranean area there were a vast number of differential metallurgical processes in use. This glass with unusual colors has an interesting story behind its name and coloration. 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. The major components of these slags include the oxides of calcium, magnesium, silicon, iron, and aluminium, with lesser amounts of manganese, phosphorus, and others depending on the specifics of the raw materials used. This will take a long time, so be prepared to set aside an afternoon. United States. "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. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." See if holding onto your favorite action figures as a kid has paid off. On the other hand, slag glass can easily leave people confused. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. Have you ever wondered what someone meant by slag glass? The colors of slag glass are also a great way to identify authenticity. Careful consideration of the slag type used is required, as the high CaO and MgO content can lead to excessive volume expansion and cracking in concrete. These lamps rarely sell for less than 100 dollars. Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. How do you grind glass without a grinder? A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. Steel Slag Rock Cost. The marbling should be a creamy white color that is evenly mixed into the base color. Is slag glass natural? Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. 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. Mineral salts, metal salts, uranium, lead, and more have all been used to create unique effects in vintage glassware. $10.85 shipping. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. This leads to marbling in the colors of the glass. Challinor, Taylor, and Co. also made their own version of this type of glass around the same time. Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. The major phases of ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates. Pelletized slag is generally used for lightweight aggregate but can be ground into material similar to GGBFS. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. ft. 509 E Colgate Dr, Tempe, AZ 85283 $315,000 MLS# 6521840 Don't miss this incredible opportunity to own a newly renovated townhouse with 2-car carport . Slag glass lamps are one of the most sought-after items made of slag glass. For six to eight months per year, this region is flooded and become a reservoir for drinking water and irrigation. What is the most popular clothing in Italy? BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. Telling the difference between streaks achieved by adding slag versus mixing in white-colored glass is a fairly difficult task best done by professional vintage glass evaluators. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Slag glass is a manufactured material that combines a natural byproduct with glass. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. [6] To flux the silica produced during steelmaking, limestone and/or dolomite are added, as well as other types of slag conditioners such as calcium aluminate or fluorspar. Reviews: 85% of readers found this page helpful, Address: Apt. Brown and purple are the most common colors for vintage pieces but Sowerby, as well as other manufacturers, also created some pieces in blue and green with the typical white streaking. These three manufacturers are very well known in the United Kingdom. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. Get DIY project ideas and easy-to-follow crafts to help you spruce up your space. This is listed on the bottom of most slag glass items, especially lamps. The marbling was traditionally produced using slag from iron smelting. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. The rocky whitish outer layer is also much closer to natural obsidian weathering than to the junk sometimes stuck to smelting slag . This byproduct can then be pulverized and used as a glass additive. Many manufacturers used colored slag glass to create elaborate patterns in the lamp bases and shades, while others used the glass to create everyday scenes and landscapes. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. What does Capulet do when Juliet apologizes? Grapevine, TX 76051. Thus, clinkers are a form of slag. Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. Slag glass, also known by its unique name malachite glass, originated in England in the 19th century. These lamps and lampshades were not only prized for their beauty but also the colored and marbled effect of the lights on the walls of a home. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. Faurit is a website that writes about many topics of interest to you, a blog that shares knowledge and insights useful to everyone in many fields. Challinor created slag glass slightly differently than the original process which uses true slag. Slag glass stands out from other types of glass antiques for the beautiful marbleized color patterns. 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. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. Antique slag items are usually brown, blue, green or purple. I'm sure there's other locations, but that's where I saw them. Pamela has over 30 years of experience and has been writing for 20 years. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. Similarly, ferrous slags have been used as soil conditioners to rebalance soil pH and fertilizers as sources of calcium and magnesium. Is My Penny Solid Copper or a Copper-Plated Zinc Cent? Challinor Taylor and Co. was an early U.S. producer of slag glass and created slag glassware in higher quantities than most other glass manufacturers. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. 6 Vintage Sneakers That Are Still in High Demand. If the piece is pink, orange, or red it is not vintage. Episode 15, (Video) How To Identify Slag Glass by Dr. Lori, (Video) Incredible Blue Slag Spill: Searching for the Rarest, (Video) Iron ore slag jewelry from Shenandoah Valley VA, (Video) Bulk Slag Glass Unboxing, Initial Processing, (Video) Crushing Glass Slag to get Gold , (Video) brushing CHEAP concrete onto a gravel driveway (adding strength and resilience), (Video) Junkyard Flintknapping - "Federal Law Forbids Re-Use of This Bottle." Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is a latent hydraulic binder forming calcium silicate hydrates (C-S-H) after contact with water. 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. Antique Vtg Sheffield Style Hanging Ceiling Light Lamp Fixture Old Etched Shades. Without knowing important and often minor differences they can be easily mistaken. Slag is the byproduct of steel production. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. The most effective method to detoxify alkaline ground water discharge is air sparging. Not all glass pieces are clearly marked. Furthermore, slag can be classified based on the abundance of iron among other major components. 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. You can find antique slag lighting fixtures for sale on websites such as Etsy for as low as $20 or as much as $16,000. 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. To tell the difference between obsidian and slag, a byproduct of steel slag is a of! 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