Talonst is right in the sense that if you use the torch flame to bring the whole piece being worked to a consistent temp within the annealing range for the glass being used and keep it there for a period of time, the glass may be destressed. Of course then you must slowly drop it through the strain point and back to ambient at a rate which does not induce any new stresses. Bottom line is that a flame anneal is not the equal of a full kiln anneal under digital control and good practice dictates that you not use it as a substitute.
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