... a blue green gel or light blue crystalline powder that is used in the manufacture of rayon, battery electrodes, and other copper salts. It is used as a mordant in dyeing, pigment, feed additive, treatment for storage rot on cranberries, and fungicide against bacterial soft spot on lettuce, peaches, cranberries, and walnuts. It is also used in herbicides, insecticides, treating and staining paper, antifouling marine paints, corrosion inhibitors, electroplating processes, electronics, fabric and textiles, flameproofing, fuel additives, glass, ceramics, cement, metallurgy, paper products, pollution control catalysts, printing and photo copying, pyrotechnics, and wood preservatives.