Talc Powder C98 Gray 1 LB Bag Capital Ceramics Used in ceramics, paper making, plastic, paint and coatings, rubber, food, electric cable, pharmaceuticals, cosmetics etc. Mineral composed of hydrated magnesium silicate. Gray in color. Widely used in the ceramics industry in both bodies and glazes and in low-fire artware bodies it imparts whiteness and increases thermal expansion to resist crazing. It is used as a cosmetic (talcum powder), as a lubricant. Used in Pottery glaze formulations and in clay bodies.