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calcium sulfide[′kal·se·əm ′səl‚fīd]
CaS, a salt; colorless crystals with a density of 2.58 g/cm3 and a melting point of 2000°C. Calcium sulfide is obtained by the calcination of CaSO4 with charcoal. It is used in the preparation of luminophors and in the tanning industry for the removal of hair from hides. Calcium hydrosulfide Ca(SH) 2 is used in the production of synthetic fibers.