Review on 👨 Just For Men Shampoo-In Color (Formerly Original Formula): Gray Hair Coloring for Men with Keratin and Vitamin E - Jet Black, H-60, 3 Pack - Buy Now! by Emily Myers

I don't have long hair so I can use the box multiple times. The trick is to mix only what you need from two bottles in a small container. As long as the two remedies are kept separate, they can be easily mixed and used later. Another trick is to use painter's tape to cover your ears or the edge of your hairline so the paint doesn't stain your skin. You can also use petroleum jelly to cover the area where the hair is growing to keep the dye from sticking.