For those of you who use Army Painter Dark Tone

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I admit, I am an untalented, unskilled, unnuanced painter. My skills lie in the realm of computers and their digital bits, and painting and art to me is alien. So I cheat, I use Army Painter Dark Tone when I paint. I have used it on another game systems models, but I have never had to have black on them, which is something I will need to do when I work on a new CSM army I will be doing soon. So, my question is, what color, I assume would be a grey, would you use that when hit with Army Painter Dark Tone would up being dark black mostly, with grey highlights?