Just mix 1-5 drops into your conditioner.
With Color Boost from Schwarzkopf, you can boost or tone your hair color in a pinch! SEMI-PERMANENT: Last up to 8 washes (semi-permanent -Results may vary depending on the number of drops used and daily care habits, hair history and texture) EASY TO USE: Color Boost offers an easy solution to revive the intensity of your hair color. Color Boost has no ammonia, no peroxide, no alcohol, just color and is ideal for all hair types.Schwarzkopf Color Boost Color Vibrancy Booster, Golden, 1 oz | CVS Just incorporate Color Boost into your favorite conditioner between full colorings.