Anti-dandruff shampoo colour?

[DiscoStu]

Why is anti-dandruff shampoo blue? Is it merely a colouring to differentiate it from other shampoos or is it to do with anti-dandruff properties in the mixture?

[Scylax]

Heaven, there are dozens of anti-dandruff shampoos on the market ; green, pink, orange, all shades, hues and admixtures. Any colour will do to attract gullible folk, but some colours are avoided, such as puce, grey,black, tartan,Fair Isle and Paisley.  Odd that, isn't it ?

[DiscoStu]

I do realise that cosmetics products are coloured to make them more appealing, but anti-dandruff shampoo used to always be a pale blue colour and I want to know why!

Having said that, Head and Shoulders is now white... But it WAS blue before, so why why why???

[BetsyLou]

Probably b'cos blue is not a colour normally associated with natural bodily fluids or disease - it looks chemical and possibly medicinal, which might make some people think that it must be more effective than shampoo that's, say, yellow.