Blue Copper Sulphate Crystals are widely utilized in analytical chemistry, fertilizer making plants, and for etching purpose. They have chemical formula CuSO4 with molecular weight of 159.609 and density of 3.60 g/cm3. These crystals dissolve exothermically in water and show insolubility in ethanol & acetone. A diluted aqueous solution of these crystals is required for treatment of parasitic infection in aquarium. Blue Copper Sulphate Crystals have ability to impart color to metals, glass, & ceramics hence are used as coloring agents as well. They possess good anti-fungal activity with ability to inhibit growth of E. coli.