Proceed as follows: mix powder and hydrogen peroxide and apply the resulting mixture with a brush, starting from the nape of the neck and working your way up to the forehead , completing all the roots before moving on to the hair shaft.
Processing time: One application can last between 10 and 25 minutes, depending on the desired result, but—please remember— never leave it on for more than half an hour! You even risk burning your hair.
The last step is to wash your hair : it's a good idea to use shampoo twice to make sure you remove the compound and rinse thoroughly, to finish, as we said before, with a conditioner or regenerating mask.