850P
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
$0
A clear glaze that fires to a fine dark crackle web over the body.
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 temperature drop on the way out opens the crackle, and the smoke in the bin settles into it, so the web reads dark against whatever is underneath. 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.
