口POWDEREN BLONDE UPLightens up to 9 tones in 45 minutes.PREPARATION: in a non-metallic bowl mix with the Revion ProfessionalOxidizing Cream Peroxide 10, 20, 30 or 40 vol. (3, 6, 9 or 12%) depending on the level of tone of the natural color of the hair and the desired lightening. In overall lightening. do not work with more than 30 vol.MIX: The mixing ratio may vary between 1:1 and 1:2 depending on the technique used. The recommended ratio is 1:2