Ah, here is a clue. I had
Ah, here is a clue. I had put a small piece of French vanilla with fine silver wire, as an experiment. I recall that silver in a kiln cam affect other glass pieces in the same firing. Does it make sense that the silver could have caused this problem, even though the glass that got the stain (bullseye jade green, 145) is copper bearing but as far as I know doesn’t react with silver?