Four Reasons Color Mask Toning Shampoo Blush is a shampoo, which color pigments give a light blush pink tone for hair, prevent yellow tones and maintain the hair color. Cleanses colored hair gently; made without sulfates. Prevents static and adds shine. Use: Rub shampoo between palms, apply to damp hair and lather. Leave in for a moment and rinse carefully. Leaving the shampoo in for longer will intensify the result. Use instead of a regular shampoo whenever your hair color needs to be refreshed. Note that your hair’s porosity, condition and current shade affect the result’s evenness.