ravid,

I actually use the blue malva shampoo- have not seen the black one. It seems to be the blue and violet dies that tone down the brassiness. any mall salon will have this product by Aveda...I see it everywhere...salons that sell products (they all seem to). Yes I saturate the HP with the Blue Malva or Debbies color correct shampoo but hers only comes in tiny bottles that are a bit expensive but they work as well...leave it on 20 min. If you just shampoo with it you won't (i didn't) see any benefit.