... blue crystalphysical characteristics: Blue crystal or powder, free flowing, and soluble in water, without impurities.Fineness: 20-80 mesh, ... manufacture of copper salt leaching, copper chloride, cuprous chloride and cuprous oxide, etc. (4) Dyestuff industry: Used in ... Such as blue complexing agent. Also in organic synthesis, spices and dye intermediates of catalysts. (5) Water treatment industry. Low ...