COPPER CHLORIDE (cupric chloride) (a) CuCl2, (b) CuCl2·2 H2O CAS:  1344-67-8 Properties: (a) Brownish-yellow powder, hygroscopic, (b) green, delquiscent crystals, soluble in water and alcohol. D (a) 3/386 (25C), (b) 2.54 (25C); (a) mp 620C at 993C decomposes to cuprous chloride; (b) loses 2HoH at 100C. Derivation: (a) By the union of copper and chlorine.  (b) Copper carbonate is treated with hydrochloric acid and the product crystallized. Grade:  Technical, CP, reagent. Hazard:  Toxic by ingestion and inhalation. Use:  Isomerization and cracking catalyst, mordant in dyeing and printing fabrics, sympathetic ink, disinfectant, pyrotechnics, wood preservation, fungicides, metallurgy, preservation of pulp-wood, deodorizing and desulfurizing petroleum distillates, photography, water purification, feed additive, electroplating baths, pigment for glass and ceramics, acrylonitrile manufacturing.