Are shampoos that contain 'red 40' or 'blue 1' harmful to your hair / skln?

i noticed that a lot of shampoos contain all these color / dye stuff in them.


just curious, but would my hair or skin turn red if i keep using shampoos


that contain 'red 40' or 'blue 1' in them?


i don't think it would actually change my skin / hair color since i've been


using the same shampoos for quite a while,


but as i said, i'm just sort of curious :]Are shampoos that contain 'red 40' or 'blue 1' harmful to your hair / skln?
yes it is