JOICO Vero K-Pak Color Intensity hair color is semi-permanent and intermixable. This formula is highly concentrated and will give you fresh, vibrant haircolor results. No developer required; each shade are to be used straight from the tube! Instruction for Use: Wear gloves. Apply to clean, dry hair about 0.25?? - 0.5?? away from scalp. Leave on for 20 minutes. Rinse thoroughly for several minutes. For best results, pre-lighten hair prior to using Vero K-Pak Color Intensity. Follow with Color Endure Shampoo, K-Pak Cuticle Sealer and K-Pak Intense Hydrator.