Wella Koleston Perfect ME + is a pure and balanced color with a natural depth and brightness thanks to Pure Balance technology and ME + technology. Pure Balance technology guarantees an excellent color result from root to tip. ME + technology reduces the risk of developing new allergies by up to 60%. It covers 100% gray hair. Product for professional use. To be mixed with oxygen / activator of the same line. Consult the package insert inside for the method of application.