bubble causation

[Stephen Richard]

Lots of thing can create bubbles.  More info required.  What size? between layers? uder whole?

More information on layup and firing schedule would help.

If you fire the tiles upside down, the bubbles will migrate to the original bottom.  Then a quick fire polish can avoid much of the mumps appearance.  Needs to be really well cleaned both times.

Stephen Richard

blogs at: http://www.verrier-glass.blogspot.com/ and  http://www.glasstips.blogspot.com/