I have a question about the use of transparent red (1122) and yellow (1120) in pot melts. I'm planning to use about a dozen colors of Bullseye glass in a melt, including about 5% by weight of transparent red and yellow.
The Bullseye site warns that these colors may opalize or become incompatible at high temperatures. A pot melt goes to 1680F and holds there for 90 minutes to make sure the pot empties. What exactly does "become incompatible" mean? I don't mind if the glasses opalize or bubble because that sort of stuff happens all the time in a pot melt. But are those glasses also at risk of changing their COEs, and could they cause the finished melt to crack? That would not be fun.
I'd appreciate any advice.