If you want to banish grays and reclaim youthful-looking hair, look no further than Schwarzkopf Keratin Color. This long-lasting color boasts up to 100% gray coverage and up to 80% less breakage (vs. untreated hair).If your hair is longer than shoulder length, we recommend using 2 boxes of Keratin Color hair dye for the application. Please be sure to read and follow all safety statements and instruction leaflet before use.