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Permanent hair dye with pigment-lock technology that locks the color without the use of ammonia. It offers 100% coverage of white and gray hair, long lasting and shiny color, while at the same time it treats and protects the hair from damage.In a comparative study with the first-selling ammonia hair dye on sale, Argan Oil Advanced Colorant won over 80% of women who said they would replace the dye of their choice with the KORRES dye of exclusive Pigment-Lock technology.