I just started blowing out my hair for the first time in my life, i happen to have wavy/curly thick hair. I use this product called cloud9 blowout which is supposed to be "heat activated" whatever that means and it also is supposed to preserve color.
I asked my hair stylist how a shampoo or a serum could preserve color she told me that a lot of the shampoos and serums of that nature are actually "low ph" which in chemical terms actually means there is more acid in it. I never would have thought. But i thought it would be a cool tip to share :)