CATEGORY: Semi-Permanent Can be used immediately following a relaxer service. No ammonia. No peroxide. Provides intense gray coverage with Advanced O2 Technology and works as a great refresher for permanent color to add luster to dull-looking hair. Advanced O2 Technology uses oxygen in the air as the catalyst to develop the color vs. heat or hydrogen peroxide. The end result is shiny, moisturized color with gray coverage that lasts up to 12 shampoos. Nine intermixable shades that cover gray on heads with up to 50% gray.