Recapture Your Handsome Black Hair With This Revolutionary, No-Fuss Instant Blackening Shampoo. Black Hair Shampoo Colors Your Hair Black In Just 5-30 Minutes And Lasts Up To 4 Weeks. Helps Strengthen And Nourish The Hair And Hair Roots. Helps Give The Hair A Darker Shade Of Color With A Silky And Shiny Look. How To Use: 1. Please Be Sure The Hair Is Dry Before Use. 2. Wear The Gloves. 3. Squeeze Out The Cream, Mix Evenly And Apply On Hair. 4. Massage Hair Slightly Until The Cream Spread Evenly On Hair. Keep The Cream On Hair For 5-10Mins. If The Hair Is More, Please Use 2-3 Sachets For One Time. 5. Wash And Blow Dry Hair. Attention: The Coloring Effect May Be Affected If The Temperature Is Low Or The Hair Is Hard Or Resistant. If The Blackening Effect Is Not Perfect, Please Appropriately Extend The Time For 15-30Mins. Warning: For External Use Only Avoid Contact With Eyes. If Contact Occurs, Flush Completely With Cool Water.