What It Does As Gibson describes, demi-permanent dye includes small amounts of peroxide to allow the color to penetrate the shaft to an extent, but without the need of ammonia. The ammonia-cost-free formula causes it to be gentler on the hair than permanent dye, but a lot less very long-Long https://thekiwisocial.com/story6134192/rumored-buzz-on-services-for-hair-color