BC Color Freeze Sulfate-Free Hair Shampoo for colour-treated hair, brings hair to its optimal pH 4.5 level to perfectly freeze colour pigments. For long-lasting intense colour. Ideal for use in post-colour service and home maintenance. Gently yet effectively cleanses coloured hair. Tightens and stabilises the matrix thus keeping the colour pigments frozen deep inside the hair. Works to neutralise chemical residues while adjusting hair structure. Prepares hair for the benefits of BC care products.