This grogged red stoneware GECH30 0-0.2 is an absolute must. For throwing, modelling, sculpture and raku. With 30% of grog 0-0,2 mm Single or dual firing
African Stone. AFRICANSTONE High temperature black stoneware with 40% grog 0-02 mm This is a black stoneware with 40% of 0-1 mm coarse grog. It fires black in an oxidizing. Mettallized glint in reduction. To prevent bubble due to maganese, program a very slowly firing.