Schwarzkopf Professional BC Bonacure Clean pH 4.5 Colour Freeze Silver Shampoo (1000ml) is a pigmented shampoo specially formulated for use on grey and lightened hair types, protecting it from unwanted yellowing. This shampoo lightly distributes blue-violet dye through the hair, neutralising unwanted warm undertones by preserving and reviving natural cool tones. Its unique pH-balanced formula returns the hair and scalp to its optimum pH value of 4.5, improving the structure of hair both inside and out whilst retaining 90% of the colour pigments inside the hair's matrix, preventing premature fading for long-lasting, vibrant colour for up to 30 washes. In white hair, the shampoo adds an ashy shimmer and lightly brasses for definition. Free from SLS/SLES, Silicones and artificial colours. Schwarzkopf Bonacure products are not tested on animals, and the formulas are vegan-friendly. Directions of use: Apply the violet shampoo to wet hair. Work in and leave for 2-5 minutes as a toning shampoo. Rinse thoroughly. To avoid potential staining, it may be best to apply shampoo with protective gloves.