1. A two part composition for dyeing keratin fibers, comprising a copper compound, and a color delivering ingredient selected from the group consisting of natural dyes, color contained actives, vitamins, co-enzymes, bioflavonoids, flavonoids, isoflavonoids, neoflavonoids, and combinations of two or more thereof, at a pH of 4.5 or less, wherein the color contained actives are selected from the group consisting of antioxidants, antimicrobials, phyto-therapeuticals, and combinations of two or more thereof.