891. Northern Lights. Raku Firing: Spectrum Raku Glazes can be fired anywhere from 1600 °F up to cone 06 (1850 °F) in either an electric or gas kiln. Spectrum recommends firing 850 to 859 to a peak of 1700 - 1750 °F and 860 to 866 to a peak of 1600 - 1650 °F. The glazes pieces should be allowed to cool in the kiln to 1600 °F.
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