To use this hair colour, first, do a patch test on a small area of your skin. If there's no redness or itching after 24 hours, you're good to go. Squeeze the gel from the 3 - oz aluminum tube and apply it evenly to your hair. The gel base makes it easy to place the colour accurately. Leave it on for the recommended time. Rinse it out thoroughly. Since it doesn't require a developer, the process is quite simple. After using, the lactic acid and castor seed oil in the formula will help keep your hair in good condition. But remember, always do a patch test before continued use. If you experience any redness or itching, stop using the product immediately. To maintain the colour, try to use sulfate - free shampoos and avoid excessive sun exposure as it can fade the colour faster.