EDTA and its salts bind to metal ions in order to inactivate them. The binding of metal ions helps prevent the deterioration of cosmetics and personal care products. It also helps to maintain clarity, protect fragrance compounds, and prevent rancidity.These ingredients form complexes with calcium, magnesium, and iron, which allows for better foaming and cleaning performance of cosmetics and personal care products. By binding with metal ions, these ingredients prevent the metals from being deposited onto the hair, scalp and skin.In Colorants this helps to preserve the intended color result and product stability in case of metal ion exposure during manufacturing of the tint.