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What is Raku?

Thermal shock

Raku firing also affects the functionality of pieces. Raku is fired at the same temperature as the bisque firing, so raku ware is porous. This is necessary because clay fired to maturity won't withstand the thermal shock of raku. Since the raku glazes craze, a raku vase filled with water will seep a little, and raku is not appropriate for use with food. Many raku glazes depend on heavily reduced copper for their color. While the effects are striking, they don't last forever. Lusters and copper matts gradually fade to green and brown over the course of a few years

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