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Copper-based reactions tend to be variations of deep red to black
Appears close to clear with blue/green tints
the mottling disappears and the color is consistent
At full fuse and capped with clear glass
The clouding can be erased from an uncapped piece by capping with clear glass and firing to a full fuse
BE - 0146 Steel Blue Opal Frit Type:Medium Copper-based reactions tend to beContains Copper May React With Selenium, Sulfur, Reactive (000009, 001009, 001019) See the Bullseye Reactive Potential charts for more information Working Notes At tack fusing temperatures, the surface frequently develops a metallic gray film. This usually disappears at full fusing temperatures. To maintain the metallic effect, fire as quickly and low as possible. Dark interface reaction likely with sulfur glasses (for example 001137, 001437, 000137).