Better color strength results are dependent on the metal salt used (Kamel et al., 2009). Strong co-ordination tendency of Fe enhances the interaction between the fiber and the dye, resulting in high dye uptake (Jothi, 2008). Ferrous sulphate and Copper sulphate have the ability of forming coordination complexes (Co ordination numbers are 6 and 4 respectively). Functional groups such as amino and carboxylic acid on the fiber can occupy the unoccupied sites on interaction with the fiber. Thus, a ternary complex is formed by the metal salt on which one site is with the fiber and the other site is with the dye.