Yes, burnt. It is carbon
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March 3, 2011 at 8:04 am #11960
Stephen RichardParticipant
Yes, burnt. It is carbon from your glue. Apparently it was unable to vent before the bottle closed. You need to do a long soak at a temperature below that at which the bottle begins to slump. Is your frit compatible with the bottle glass?
Stephen Richard
blogs at: http://www.verrier-glass.blogspot.com/ and http://www.glasstips.blogspot.com/
