874P
Cone 08 raku firing, about 950°C · Electric or gas kiln, then reduction in a bin · Reduction opens the crackle and darkens it with smoke · Results vary piece to piece with the reduction · Lead-free and rated non-toxic
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A bright yellow-green under a fine crackle.
Spectrum's raku glazes are made for the raku cycle rather than a standard firing. The work fires to cone 08, around 950°C, in either an electric or a gas kiln, and goes into a reduction bin while it is still red hot — either straight out at temperature or after cooling in the kiln to about 870°C, which changes the result. Most of the finished surface is made in the bin rather than the kiln: the starved atmosphere reduces the metal oxides in the glaze, and the temperature drop on the way out opens the crackle, which then takes up smoke and reads as a dark web. Because the surface is made by the reduction rather than by a controlled cool, two pieces glazed from the same jar will not come out identical — how long the reduction runs, what is in the bin, and how fast the work is pulled all move the result. It is lead-free and rated non-toxic.
