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Talcum powder is called PULVISTALCI in English, which is white or white-like, fine and non-sandy, and feels greasy to the touch. Odorless and tasteless. This product is insoluble in water, dilute mineral acid or dilute alkali hydroxide solution. Its molecular formula is Si4Mg3O11·H2O, and its Chinese alias is hydrated magnesium silicate ultrafine powder. Old starch

is a high polymer of glucose, also known as starch in catering industry. The general formula is (C6H12O6)n, and maltose is hydrolyzed to disaccharide. The chemical formula is (C12H22O. Starch includes amylose and amylopectin. Starch is a nutrient stored in plants, stored in seeds and tubers, and the starch content in all kinds of plants is high.