what is causing ugly black metallic spots on the back side of fused glass. Been teaching this for 10 years and never saw it before. Tried everything. Only thing different is using Wissmach glass (ran out of Spectrum). Maybe something new added to our glue? Alene’s quick dry. Anyone else having a problem? It has happened about 5-6 times. I could post a photo, but don’t see a place to do it. email@example.com
A new case of black spots. It is actually between the layers of glass and this time came to the surface through a bubble. Tried to cover it with another piece of opaque glass. It rebubbled and I drilled it out the black stuff with my Dremel., filled the hole with white frit and covered with more opaque glass. Still not pretty and of course the back is still black. No answers to this black stuff, yet.
It might be a combination of something new added to the glue or the slight texture to the Wissmach glass, which traps more bubbles. My 20 minute bubble squeeze may not be enough. Think I will try a little longer bubble squeeze.
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