Product Description NAK Hair K.REVIVE Express Repair Power Mask is a PROFESSIONAL USE ONLY product. Finishing point for any treatment and chemical services in the salon. Provides fast and effective repair in just 2 minutes. pH 4.0 – 5.0 WHAT IS IT: A high performance leave-in hair mask that preserves and strengthens disulfide bridges. Repairs hair damage and restores radiance and resilience to all hair types after lightening, colouring and chemical change. APPLICATION: After cleansing with your preferred NAK Signature shampoo, do not apply any rinse-off conditioner or treatment. Towel dry hair thoroughly, warm the product in your hands and using the correct dosage, apply from the mid-lengths to ends, avoiding the root area. PROCESSING TIME: Leave in for 2 minutes. Do not rinse. NEXT STEPS: Comb through and style as desired. CAUTION: Avoid getting it into the eyes. In case of contact with eyes, rinse thoroughly with water. Keep out of reach of children. FOR EXTERNAL AND PROFESSIONAL USE.