No, blue would be oxidizing. White or yellow would be reducing. This seems to be a fairly common occurance with Bethlehem torches (particularly the Piranha and the Betta).
If the center candle is excessively long, call the manufacturer. A single candle that cannot be cleaned up can make the flame a reduction flame - whether you want one or not.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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