Post-Color Neutralizing Shampoo pH 4.5 removes alkaline residue, restoring the pH to its normal level. It helps seal the pigments deep down into the hair promoting a brilliant, long lasting hair-color. DIRECTIONS: after rinsing the coloring cream, apply the shampoo to damp hair and massage in gently. Leave for 1-2 minutes. Rinse thoroughly and repeat if necessary. Then proceed applying the Post-Color Conditioner.