Multicolor brush - real mixing emulation

When I paint with acrylics, I mix paints. For example I mix black with red, blue and green. This color is not very uniform, and it’s very nice.
Can you emulate this with Krita brush?
I just found exactly the discussion here:

Caveat: I’m not concerned too much about RGB values. I’d like to see variation in color, where some percentage is a tru mix (black or grey) and some percentage is partial mix…
When I write it, I see how difficult is this issue…
There is a mixbox code which could be used to create a brush:

You could have saved yourself some typing by using the search first.

Thank you very much for all the info! I know now what to search for :slight_smile:
This topic is fascinating.