In the first theoretical stage we’ll analyze the materials and their technical sheets about firing and vitrification. We’ll use, above all, stiff clays (non-porous clays after high firing).
In brief this course examins:
1) the study of stiff clays (porcelain, stoneware, gres), their chemical composition, deformation, colour, etc.
2) moulds creation, technical schedule, examination of unusual cases.
3) low and high temperature firing, glazes, ‘fritte’, colours, oxide, pigments.
Slip casting on mold (tile shape)
After 65 minutes; note: it starting to shrink.
Stoneware is a vitreus or semi-vitreous ceramic made primarily from stoneware clay or non-refractory fire clay. Stoneware is fired at high temperatures. Vitrified or not, it is nonporous. In Italy is called Gres (fire clay, ball clay, klinker) normaly is with grog (chamotte) 0.1 to 2.0.
In this case grog was 0.2, fired at 1050°C and than painted with pigments and clear and fired at 1260°C