Do not colour if you have used any sort of relaxing product in the last 7-14 days.My ThoughtsThe hair dye was easy to use and there was very little mess on the bottle or on my work surfaces as it didn't drip which was great, there were areas where the dye was on my skin and I wiped the thick away with a baby wipe once the dye was applied and then of course gave another rub in the shower.