Using this Manic Panic Plum Passion hair colour is easy. First, make sure to do a patch test on a small area of your skin to check for any allergic reactions. Wait 24 hours. If there's no redness or itching, you're good to go. Wet your hair thoroughly, then apply the colour evenly, starting from the roots and working your way to the tips. Massage it in gently for a few minutes. Leave it on for the recommended time on the package, usually around 20 - 30 minutes. Then rinse your hair with cool water until the water runs clear. As for maintenance, use a colour - safe shampoo and conditioner to keep the colour vibrant. Avoid excessive sun exposure as it can fade the colour faster. If you want to touch up the colour, you can repeat the process every few weeks as needed.