Wella Welloxon Perfect 4% 13 Volum Oxidant 1000 ml Features It is added to the dye or hair lightener during hair dyeing and lightening processes - mix well until a homogeneous structure is obtained. The mixing ratios of each dye and lightener are different - be sure to read the descriptions of the product you use. For professional use Welloxon Oxidant 40 vol - hair When 3-4 tones of lightening is desired depending on the condition of the ground color - used in highlighting and balayage processes. Compatible with Wella Blondor powder lightener.