Energy Cosmetics Peroxide 40V is a professional-grade hair bleaching developer designed for use in hair coloring and lightening treatments. This 40-volume hydrogen peroxide solution provides maximum lifting power for significant hair lightening results. This product is for professional use only and should be used strictly according to manufacturer instructions. The 40 volume (12%) concentration is the strongest developer typically available and should only be used by experienced colorists. Must be mixed with bleaching powder or hair color before application. Not intended for direct skin contact or scalp applications.