Although the risk of developing new allergy is reduced, there remains a risk of allergic reaction that can be severe. Always ask your stylist to perform an Allergy Alert Test 48h before each coloration. Strictly follow safety instructions 

If you have ever experienced an allergic reaction to hair colorants, you should not color. ME is present in specific shades of Pure Naturals, Rich Naturals, Vibrant Reds, Special Blondes and Deep Browns of the Koleston Perfect brand.