Sexy Dark Red Hair Ideas For 22 The Trend Spotter As you applied a blue hair dye , when you wash your hair , the color starts to fade, and green starts to show It's a very common disadvantage in fantasy colors and semipermanent hair dyes As they fade, the pigments ( blue ) blends with the base (yellow), and the resulting color isn't what you expect ( green ) Naturally red hair is notoriously difficult to dye because it holds its pigment tighter than other natural hair colors Without the bleach your hair is a darker color and will not take in the blue dye as well For this personally I roll hard and go straight to Sally Beauty A range of red dyes specially designed to apply to dark hair Dying natural red hair blue