If you don't want those first gray hairs to make you look older, Just For Men's colorant shampoo makes them disappear quickly, effectively, and permanently. Many men aren't comfortable leaving their gray hair alone, which is also highly visible, especially around the beard and temples. This product works on 100% of gray hairs while respecting your hair color, resulting in a natural tone that will last up to six weeks. DIRECTIONS FOR USE: Mix the products and shake. Apply to dry hair and leave on for 5 minutes. Rinse and dry. Contains phenylenediamine, resorcinol, and hydrogen peroxide. Perform the allergy alert test 48 hours before each use of this product. May cause an allergic reaction. If you have skin depigmentation problems (vitiligo) or have a family history of vitiligo, do not use. An allergic reaction or skin irritation may cause loss of skin pigmentation. Do not use this product on eyelashes or eyebrows, it may cause blindness.