Why is dandruff shampoo always blue?

I used it a couple years ago and I realized that dandruff shampoo is always blue. Why?Why is dandruff shampoo always blue?
Not necessary. As a matter of fact my brother uses Paul Mitchell Tea Tree Shampoo for his dandruff and its not blue.Why is dandruff shampoo always blue?
It's medicated.
That's a good cute question. Maybe because when you wear black ';even a little dandruff shows'; and they want to appeal to both men and women so they use a blue bottle.
The stuff I use now is not blue (Equate).
cause its pretty, lol
Dandruff shampoo is not always blue. It just depends.





Most of the time it has to do with the additives etc. They turn the shampoo and odd colour.. blue is more attractive.