To use this Lime Crime Unicorn Hair colour, start with pre - bleached, clean, and unconditioned hair. Massage the colour into each strand. For longer - lasting and more intense results, leave the dye in for 1 - 2 hours. If you prefer a more pastel look, wash it out after 30 minutes. Don't worry about hair damage as it has no harsh chemicals or bleach. Rinse until the water runs clear, then shampoo and condition as usual. To make your colour last longer, use shampoo for colour - treated hair between applications. Remember, this product is not for use on the face, around the eyes, or to dye eyelashes and eyebrows. Protect your clothes and workspace and wear gloves. Do a patch test first by applying a small amount to your skin (like on the nape of your neck or near your elbow) and wait 24 hours. If there's any redness or irritation, stop using it. It's ready to use, don't mix it with developers, lighteners, or permanent hair colourants. It may stain your skin temporarily and fabric permanently. Keep it away from children.