Painting soot deposits on/around exhausts. How to do it?

[Brantwoodboy]

I appreciate it and thank you

[165thspc]

Oil pastels over mate base paint (Tamiya TS-80 Matte Clear) forming roof stains around smoke stack.

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Canvas modulation using soft oil pastels over a matte base paint coat.

[18bravo]

These aren’t the photos I meant, but I did take these recently. Will they do? I can probably find the others given time.

[Brantwoodboy]

Yes, those are perfect and beautiful I’m going to try but will probably butcher the attempt to recreate this

[SableLiger]

Pastel chalks work great for me.

[SableLiger]

Need to add some more colors to the palette. Mainly some reddish hues.

[18bravo]

I would almost try Tamiya clear orange over tan to replicate that odd reddish tint -on a piece of scrap first, of course.