-Apply a quarter-size amount to wet hair. -Gently massage into scalp and hair until lather. -Rinse thoroughly. -For double cleansing, apply the Chronologiste Detoxifying Charcoal Pre-Shampoo to the scalp before shampoo. -Follow up with the Chronologiste Mask (sold separately). -Complete routine with full Chronologiste collection for maximum benefits. -Avoid contact with eyes. -If contact occurs, rinse immediately and thoroughly. -Pro Tip: start by applying to scalp then emulsify with water to create a lather, it is also recommended to comb through mid-lengths and ends in shower before following with conditioner.