John Frieda Blue Crush Shampoo You've probably heard of purple shampoo for blondes but now John Frieda is making a blue-toned colour-correcting shampoo called John Frieda Blue Crush Shampoo (£7) for brunettes. It's meant to get rid of out stubborn orange tones in brown hair that's been colour processed in the past. Image Source: boots.com John Frieda Blue Crush Shampoo £7 from boots.com Buy Now