Iron-saturate teadust tests Temmoku glaze on porcelain fired reduction to cone 10 with a long oxidation soak at 1800 followed by firedown for slower cooling (see inside of middle cup for for interesting variation). Temmoku on dirty porcelain fired in reduction to cone 6 and slow-cooled with fire-down Temmoku on white stoneware fired in reduction to cone 6 with an hour (?) of oxidation soak at 1800F Sung Chun base with 6% black iron oxide on porcelain, fired in reduction to cone 6 and cooled slowly (about 150F/hr from 2200F to 1500F); hue looks a lot like those teadust colors to me, but it’s hard to make out individual crystals. Sung Chun base with varying levels of black iron oxide on porcelain; fired in reduction to cone 6 and cooled slowly (about 150F/hr from 2200F to 1500F)