Irridised glass and Thinfire

#12156
Stephen Richard
Participant

I have re-read your original post.  I bet that you are using thinfire as a separator.  This gives exactly the result you described in the second post.  The irridisation reacts with the thinfire to produce this cratering, so you must never fire irridised glass in contact with thinfire.

Stephen Richard

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

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