720C is right in the middle

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Stephen Richard

720C is right in the middle of the devitrification zone, so soaking for 30 minutes there is not a good idea. Try a long soak at ca. 677C or a quick one at 760C.  But the main thing is to have every thing very clean.  Contaminated surfaces, even if only a little, on bottles and float glass lead to devit very easily.

Stephen Richard

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

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