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The Railwire is not your personal army.
It's like the old trick of using cigarette ashes to weather steam engines.
I'd grind some really pine in a mortar and pestle and then test it on something . . . I do worry about the reaction to dull coat . . . .
Isn't this type of soot called "lamp black". It is extremely fine already, but also oily. I don't like placing anything on a model which will never dry or get easily smeared when handled. I also have my doubts that it can be successfully sealed with some clear coat. It will also be really messy when handling the model (and unlike pastel powders soap and water will be needed to clean it off your hands).EDIT: added link for carbon black. Actually, soot is a different material. Do we really know which this is? I learned something new . . .