American crew precision blend hair colour for men kit choose a shade of american crew precision blend that matches your natural hair colour mix the developer sold seperately and available here at fragrance direct in a ratio 11 with the chosen shade in a bowl we also sell hair dye mixing bowls here at fragrance direct in general about 20ml of colour will be enough for hair that is 1 inch long apply the colour to your hair following the instruction that are on the box look an