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https://maycopaintstore.com/lusters-overglazes/overglazes-and-luster-users-guide
These are expensive, especially the gold, and the vendor provides a lot of instructions to ensure that you won't waste any product.
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A user experienced this issue with five brands of gold luster, making them unusable. Panic ensued as looming orders could not be met. A session with ChatGPT finally provided the answer: Firing schedule. The preprogrammed fast-fire schedule in the electric kiln was too fast. It noted that organic compounds need time to burn out completely before 800°F. When kilns are densely packed, good ventilation is also important. Different vendors recommend different firing temperatures between cone 020-018. Unlike decal firings, the gold can, and even should, be fired while still wet.
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