Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. [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. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. These lamps rarely sell for less than 100 dollars. [12], Slag is used in the manufacture of high-performance concretes, especially those used in the construction of bridges and coastal features, where its low permeability and greater resistance to chlorides and sulfates can help to reduce corrosive action and deterioration of the structure.[13]. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. Slag glass is pressed and untempered glassware, much like depression glass. But some recent research here at USGS might change slags poor public image. For six to eight months per year, this region is flooded and become a reservoir for drinking water and irrigation. This is because the top manufacturers of the day often did leave any identifying brand marks on the fixtures. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. Your email address will not be published. Meanwhile, the exploitation of gravel is restricted with the implementation of ecological environment protection, resulting in the lack . The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. Typically vintage pieces will be worth the most, but some collectors may still value the piece. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag can be the valuable product. Thank for such an informative article!! How can I tell if I found a meteorite? Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. However, the popularity waned at times. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. Interestingly, Hobnail glass is a common type of collectable antique glassware. I grew up going to antique stores and markets with my mom and grandmother. When SSRS compares with ground granulated blast furnace slag (GGBFS) from iron making, steel slag contains toxic ingredients such as nickel, cadmium, chromium and strontium. In this case, the slag is termed synthetic. Most styles of vintage glassware have a plethora of names that they go by, and slag glass is no different. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. Steel slag is the main by-product of steelmaking, and its stacking and burying cause serious pollution to soil and water. They are a great way to add color to any room. If the base color is brown, purple, blue, or green theres a decent chance that it is a vintage make. Other types of metal ores produce different colors of slag when they are refined. Antique slag items are usually brown, blue, green or purple. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. You can determine antique slag glass with a few steps: Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. Slag is the collection of compounds that are removed. [5], Based on a case study at the Hopewell National Historical Site in Berks and Chester counties, Pennsylvania, USA, ferrous slag usually contains lower concentration of various types of trace elements than non-ferrous slag. United States. The colors of slag glass are also a great way to identify authenticity. Slag glass has a rich history that makes it extremely valuable to collectors. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). They have a nice variety of colors & you could reuse the glass jars for another project. 1,572 Sq. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." What is the safest antacid to take long-term? Ft. 2031 E Rice Dr, Tempe, AZ 85283. $10.98. The value of slag glass antiques ranges from $20 $20,000. Slag glass gets its name from slag, or the byproduct of steel production. Slag is also used as aggregate in asphalt concrete for paving roads. 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) Share sensitive information only on official, secure websites. This will ensure that the money you are spending is worth it. This is due to the rarity of the color. She co-founded the Costume Jewelry Collectors International, a global educational website. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. Top Rated Plus. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. $360,000 Last Sold Price. Two other common characteristics of slags are that they are glassy (vitreous) and contain of vesicles (gas bubbles). Its a shame we cant come up with a nicer name. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); What is Slag Glass and where does it come from? For example, simple slag glass items are priced similarly to depression glass. These are just a few of the companies that produce authentic slag glass. However, slags can contain metal sulfides and elemental metals. Newer glass by Fenton, Boyd, and Mosser may also be marked. A review of steel slag as a substitute for natural aggregate applied to cement concrete. Save my name, email, and website in this browser for the next time I comment. SOLD FEB 10, 2023. The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. An official website of the United States government. I grew up going to antique stores and markets with my mom and grandmother. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. I would like to send you pictures, but am not sure how. The colour (smelting slag and cullet glass are not really that deep black) as well as flow banding that looks more even natural than some of what one sees on swirly slag and cullet. Examine the color. [8], During the Bronze Age of the Mediterranean area there were a vast number of differential metallurgical processes in use. Slag can also be used to create fibers used as an insulation material called slag wool. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. Blast furnace slag (BFS) is a by-product from iron production in blast furnaces, which are fed by a mixture of iron-ore, coke and limestone. 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. Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. Slag glass is commonly found in purple, less common in blue and brown and green. $35.00. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. Egyptian patterns were also common due to the interest in the tomb of King Tut in the early 1920s. Rainaud, and Tiffany Studios. Tiffany, Roycroft or Steuben lampshades made with slag glass can command prices of up to $20,000. How to Cut Hand Rolled Art Glass | Delphi Glass - YouTube. Serious antique glass collectors will be familiar with "slag glass" which became popular in the late 1800s and is still made today. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. So how can slag help? These colors are created through different repurposing techniques. What is the most popular clothing in Italy? 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. Mar 18, 2020 6367. Applications. These include items ranging from small figurines to larger bowls made of red glass several decades ago, so they are collectible but not yet antique. Slag glass gets its name from slag. Sellers with highest buyer ratings; The consistent yet subtle pattern gives Slate Grey-N added character to an otherwise plain background. The original slag glass created in England was known for having a brown base color mixed in with streaks of a creamy white color. The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. Production of slag glass originated in late 19th century England. Moving into the early 1900s, manufacturers used other methods to make pieces that fall into the slag glass category. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. Designers would create intricate stained glass style patterns and scenes within lampshades. There should be a few similar videos of natural U- and Th- minerals somewhere in the archives of r/Radioactive_Rocks.. Slag glass was often used in lampshade production as well as for crafting many different types of decorative objects. In this case, the slag used for marbling glass is produced when iron is heated during the production process. Malachite stones have wavy striping in a green-tinged milky white on top of a darker green. Manufacturers usually make slag glass by mixing this silicate slag with clear glass. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Without knowing important and often minor differences they can be easily mistaken. 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. Modern slag glass is still being made today in USA, and comes in a variety of colours. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. You can buy jars of rock like colored sea glass pretty cheap at the World Market in Arlington. . 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. The early 1920s often did leave any identifying brand marks on the fixtures produce titanium dioxide the. $ 20,000 sought-after item that can go for a lot of money amp ; you could reuse the jars... During steel production of the companies that produce authentic slag glass means that it has powdered silicate from! 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