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Silver Unobtainium is also a dark blue sparkle that has silver in it. It is easily worked and can take a lot of heat. To keep the color most vibrant, work in a neutral to slightly oxidizing flame. Try to avoid deep encasement that may cause cracking. When worked in an oxidizing flame it stays a dark blue color with wispy hues of silver over it. If reduced the color does not show much sparkle but still has many vivid colors.
Northstar Glassworks borosilicate rods are approximately 20" in length. Sold in 1/4 lb. bundles. 33 COE. Images courtesy of Northstar Glassworks.