wet grinding method. After accurately weighing according to the formula of tin oxide 50%, calcium carbonate 25%, quartz 18%, borax 4%, and potassium dichromate 3%, put the material into a ball mill (borax and potassium dichromate are dissolved in hot water and then added), add a proper amount of water to finely grind, then put it in a gypsum mold or a shallow bowl to dry it, dry it, then grind it and put it in a crucible or sagger, calcination at high temperature of 1160~1180 ℃ for 4~6h must be carried out in oxidation flame. The hardened pigment hard block is sent to the stone wheel mill for coarse crushing, then wet grinding in a cylindrical ball mill, and finally the pigment chrome tin red is obtained by sieving (325 mesh), washing, filtering and drying.