Key Benefits Removes damaging, hair-dulling impurities Deeply cleanses without stripping or drying Improves color vibrancy, shine, and softness A deeply cleansing yet gentle and color-safe clarifying shampoo that removes heavy metals, hard water minerals, chlorine, pollutants, product buildup, and excess oil that can cause dull, discolored hair. No.4C helps revive soft, vibrant hair without leaving it dry. Use it weekly or as needed to hit the reset button on healthy-looking hair. How To Use Apply to wet hair. Lather well. Leave on for up to 5 minutes. Rinse and follow with N°.5 Bond Maintenance® Conditioner, N°.8 Bond Intense Moisture Mask, or treatment of choice. Use weekly in place of regular shampoo.