Biolage Colorlast Shampoo helps maintain the color depth, tone and shine for vivid color-treated hair. Give her hair salon-vibrant color for up to 9 weeks. Low pH shampoo for color-treated hair helps prolong color vibrancy. Gently cleanses to prevent unnecessary stripping of color. Paraben-free formula is suitable for color-treated hair. Forget about de-saturated color.