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Copper, Selenium, Sulfur
Lead, Selenium, Silver, Sulfur
Very dark brown.
Torch: Color develops in the flame. Keep this style transparent by using it in small amounts with minimal heatwork.
Kiln: Working properties and kilnformed characteristics are consistent with sheet glass.
The brown color of this style results from reactions between several of the elements that are listed as reactive with one another elsewhere on this chart. As such, it may react with many of the other glasses that contain these elements. However it is likely that the reaction will be subtle or unnoticeable due to similarities in the color of the reaction and the color of the glass. We advise labeling all striking glasses.
This style is not suitable for kilncasting because it can opalize and/or become incompatible when held at high temperatures for a extended periods. It may also opalize and/or become incompatible in instances where processes exceed the parameters of the test for compatibility. Testing recommended when heatwork exceeds these parameters.