Wella Koleston Perfect ME+ 4/77 2oz It is the first and only professional hair color brand to feature breakthrough technologies, Pure Balance Technology, and ME+. The Pure Balance Technology is designed to minimize the formation of free radicals during color formation by deactivating impurities like metals present in hair. Free radicals interfere with color formation during the color development and are a key cause of hair damage. With Pure Balance Technology, the result is even purer color results with natural depth and shine and significantly less hair damage, color after color. The ME+ technology is a scientific breakthrough designed to replace extreme sensitizers, PPD and PTD, reducing the risk of developing a new allergy to hair color. The new formula also delivers color that is significantly more even, balanced and true to tone from root to tip offering better balance of tone and control of depth with up to 100% grey coverage. The vibrant color portfolio spans naturals, brunettes, reds, and blondes, plus a special mixing range to make a wide array of shades possible. ATTENTION: These products require professional expertise. Seller is not liable for any adverse outcome resulting from the use of this product.