Crystal Ferrous Sulphate is notable for its greenish blue appearance. It easily dilutes in water. This chemical is produced as the by product during pickling of steel or at the time of titanium dioxide production. Crystal Ferrous Sulphate acts as effective mordant in dyeing wool and also during purification of water. This versatile chemical is used for the formulation of additive, ink, fertilizer and magnetic ferric oxide. It acts as reliable substitute of aluminium sulphate. Standard of this chemical has been verified on the basis of its storage life, formulation method, chemical stability, effectiveness, toxin content and possible health hazards.