Our Black Hair Shampoo Is Carefully Formulated With 1, 2-Hexanediol And Polyquaternary Ammonium Salt-10. Designed Specifically For Easily Covering White Hair. The Usage Method Is Extremely Convenient: Before Use, Make Sure Your Hair Is Dry. Please Wear Protective Equipment When Operating And Apply The Face Cream To Areas That May Come Into Contact With The Skin, Such As The Face, Neck, Behind The Ears And Arms. Apply The Hair Dye Evenly To Your Hair, Making Sure Every Strand Is Covered And Wait For 30 Minutes To Allow The Dye To Fully Penetrate Into Your Hair. Rinse Your Hair Thoroughly With Warm Water. And While Dyeing Hair, It Can Nourish The Hair, Improve Dryness And Frizz, And Make The Hair Soft And Shiny.