The product is a MASK (so it has a result similar to semi-permanent dyes) and not a permanent dye as the description on Scroutz states. It should be used directly on washed, preferably dry hair and bleached, NOT on unwashed hair. And of course, away from peroxide.
The result is quite satisfactory, however, I find semi-permanent dyes at a much lower price that I dilute with conditioner and the packaging lasts longer that way.