... , As:4ppm max 3.HIGH QUALITY LOWEST PRICE NAME :COPPER SULPHATE Heptahydrate CuSO4.5H2OFEED GRADE COPPER SULPHATE, Cu≥25.06%, Pb≤0.0010%, As≤0 ... used as a textile mordant, agricultural pesticides, water fungicides, preservatives, and also used for tanning leather, copper electroplating, ore dressing third, Used ... ARE INTERESTED IN OUR PRODUCTS ,PLS CONTACT US. ON SALE COPPER SULPHATE