SELECTION OF OXIDANT CREAM: Oxidant Cream 10 Vol. (3%): To darken a tone or paint tone on tone. Oxidant Cream 20 Vol. (6%): To cover the whites - to lighten them a tone. Oxidant Cream 30 Vol. (9%): Lighten 2 or 3 tones - to emphasize redheads. Oxidant Cream 40 Vol. (12%): For lightening 3 or 4 tones and super lighteners.