Black spots


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.

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