Wear gloves when you are applying this toner! It is very strong but is one of the best ones I've tried. This toner gives my hair a boost and stretches out the time between colouring. I would recommend leaving it in for 5 mins then lathering and rinsing off. It does stain so wash it off your tiles. I do find it leave your hair a bit dry but that's an ok trade off for the results.