Wash the hair with a silicon-free shampoo and dry it. Mix the proper amount of the powder with tepid water until you get the consistency of yogurt. If you know your hair is generally resistant to dyeing (e.g. grey hair) you can add a teaspoon of salt. Put directly on hair. Put on a plastic washing hat and roll a towel around your hair. Wash the dye from the forehead nape and ears. Leave on the hair for 1 hour. Wash the dye off with warm water. Be patient â the color becomes more intensive in a few days after dyeing because of the natural process of oxidation.