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Calcium carbide (molecule formula: CaC2), is a kind of important chemical raw materials produced from the chemical processing of limestone, pure calcium carbide is almost colorless and transparent crystals.very pure calcium carbide crystals are large sky-blue crystal with its color being same as quenched steel.Industrial calcium carbide is divided according to their purity: gray, brown or black. Its crystallization section is gray while high purity version exhibits purple color.