Copper Sulphate

Copper sulphate is used with citric acid as a mordant (use 5g copper sulphate and 5g citric acid per 100g fibre). Copper sulphate is also used for modifying dye baths to create greener or browner shades of colour and will increase light and wash fastness. Use 5g of copper sulphate for each 100g of yarn or fabric.