Garnier belle colour golden blonde 73 when you wash your hair water penetrates through the cuticle to the capillary fibre swelling it as a result the molecules of colourant which are held inside the fibre can escape through the breaks in the cuticle when hair is rinsed regular use of a hair dryer excessive styling of the hair or prolonged exposure to uv can also make the problem worse garnier haircare expert coloured or highlighted hair needs 2 things protection against water when it