Copper Sulfate Pentahydrate is the most common sulfate salt of copper. The blue, crystalline inorganic compound is used as a root killer in both agriculture and non-agricultural settings. In the textile industry, Copper Sulfate Pentahydrate is used as a mordant in natural dyeing processes. Sales Specification Appearance: Transparent blue crystals, granules, or powder Cu: 25.5 Pb: 0.0023 Cd: 0.0004 Fe: 0.0181 Zn: 0.0293 CuSO4.5H2O: > 98.5 pH 5%: 4.2 Packing 50 LB Paper Bag, 44 bags per pallet DOT Transportation UN Number: 3077 Proper Shipping Name: Environmentally Hazardous Substance, Solid, N.OS. (Cupric Sulfate) Hazardous Class: 9 Packing Group: III