1. Also known as copper chloride. 2. CuCl₂ Yellowishbrown, deliquescent powder soluble in water, alcohol, and ammonium chloride. 3. CuCl₂_ H₂O A dihydrate of cupric chloride forming green crystals soluble in water; used as a mordant in dyeing and printing textile fabrics and in the refining of copper, gold, and silver.