Originally posted by tidoco2222
Highlighting black I think is one of the toughest things to do. I have found a way that works well for me, I use GW paints as well so basically I mix a tiny amount of codex grey into chaos black and then paint this over the whole area I want to be black except the very deepest parts and then basically I just add more codex grey until I have near pure codex grey for the final highlights.
Then I take a tiny bit of chaos black and then add two to three drops of clean water ( I use and eye dropper for this) I then paint this on as a wash for three or four coats and then when it is dry it helps to smooth out the transitions in the different highlight stages,
that is the method I used on that mini.
Hope that helps.