Just For Men Original Formula Real Black Hair Dye H-55 is a single application hair colourant that helps to restore your original hair colour and create a natural look. Keratin, olive oil and vitamin E are used for strong hair. Just For Men Original Formula Real Black Hair Dye H-55 is a foolproof haircolour which lets you pinpoint greys, as it shuts itself off at just the right colour, giving you the perfect real black results every time. It works within 5 minutes and the results last up to 6 weeks. Easy to use Just For Men Shampoo-In Hair Colours are easy to use. Simply comb in the dye, then the shampoo, and notice the difference in just 10 minutes. No mixing. No mess. Does not contain ammonia or peroxide As an added bonus, Just For Men Shampoo-In Hair Colour do not contain any peroxide or ammonia. It is gentle on your hair and keeps it looking impressive at all times.