Striker Contains Sulfur May React With Copper, Silver See the Bullseye Reactive Potential charts for more information Cold Characteristics Consistent color. Working Notes A cadmium glass. This style is not suitable for kilncasting because it can opalize and/or become incompatible when held at high temperatures for an extended period. 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.