What It Does As Gibson clarifies, demi-permanent dye incorporates minimal amounts of peroxide to enable the color to penetrate the shaft to an extent, but without the need of ammonia. The ammonia-free system makes it gentler on the hair than permanent dye, but considerably less long-lasting. Customization: Lowlights are flexible https://binksites.com/story10429676/the-5-second-trick-for-hair-color-specialists-in-my-area