"Schwarzkopf Professional BC Bonacure Clean pH 4.5 Colour Freeze Silver Treatment (500ml) is a pigmented, restoring hair treatment specially formulated for use on grey and lightened hair types, whilst protecting it from yellow. This treatment gently neutralises 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 uses. In white hair, the treatment adds an ashy shimmer and lightly brasses for definition. Free from Silicones and artificial colours. Schwarzkopf Bonacure products are not tested on animals, and the formulas are vegan-friendly."