A few days ago, while I was away on LGM, Silvio Heinrich (a cool coder -and- painter from the Krita team) added the new Dulling mode to his “Color smudge” engine.
So it’s now possible, in the “Smudge Rate” properties panel of this brush engine, to choose between “Smearing” or “Dulling” Smudge modes.
“Smearing” is the old behavior (morel like a classic smudge)
“Dulling” is the new mode, doing color mix similar to mypaint or other famous painting softwares.
This is a very good news, so I’ve already added 3 presets in the default pack using this wonderful feature.
Here is a screenshot showing a quick flower painted mostly with this engine (except the light effect at the center);
Also you can see the added presets, which are the “purple strokes” ones.