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glass stuck in casting mold
Help! I am somewhat new to fusing, but decided to venture into jewelry making by using frit in a casting mold. Despite liberal use (4 coats) of boron nitrate spray, when I took it out of the kiln, it was stuck fast to the mold (Holey wine glass form). Freezing it for 20 minutes didn't help, neither did wedging a knife blade between mold and glass and hitting the handle. (did break off the tip of my knife!). Is there anyway to salvage either the mold or the pendant? What about the other mold (3 margarita glasses with posts for holes) that I haven't used yet? How to keep glass from sticking in it? THanks for any suggestions from those more learned than I!