The Schwarzkopf BC Bonacure Color Freeze Silver Shampoo (available in 250 and 1000 ml) is specially designed for white, gray or lightened hair. This shampoo neutralizes unwanted warm undertones and refreshes cool color tones. With an optimal pH of 4.5, it offers up to 90% color retention for 30 washes. The shampoo is vegan and free of SLS/SLES sulfates, silicones and artificial dyes.