Xmm....well I dye my hair blue-black and I m using Qod max..
It defenetely takes out the blue shade and it quikly turns into a very dark brown-almost black....I hate any brown shade on my hair and I 'm trying to find a way to retain the colour after keratin.

If you dont mind, could you post your review for Kerapremium after you've used it?
I think that it will be my next purchase