What exactly do the shampoos for certain colors of hair do?

You have them for blonds,brunettes and redheads, and they are made just for their hair color. but what exactly do they do? do they have something that "cleans" that hair color? but if you use them, and you are naturally that color, what do they do?

Public Comments

1. they have different ingredients in them to bring out highlights
2. They supposedly make the color last longer. i tried that Sheer Blonde stuff, and i did notice a bit of a differece in the Shinny-ness of my color, but other than that, it does nothing.
3. they're great.. at least the professional ones... don't do over the counters..the cheap are full of fillers .. they enhance your color & strip the hard minerals built up that can cause discoloration to your hair... most say use 2-3 times weekly..but you can get some dailey milder shampoos...I like the Redken line.
4. These shampoos contain compounds that are supposed to enhance the color of color treated hair and help it to last longer between colorings.
5. nothing its all the same
6. see their supposed to just leave the colour into your hair, like eg. if u have highlights, it wont remove it. that way u can have highlights and also clean ur hair. i dont think it makes a difference if you put it on when u have non-colored hair. i mean, curling shampoo didnt work on my hair. =) hope everything works out well!