I seem to recall that John Allen's GD Line ashpits (where steam engines drop out their ashes after a run) had real ash in it, perhaps cigarette ash?? He also had a red bulb hidden in there, so when a model engine "dropped it's fire" the pit would glow red as if hot coals and ash had been dumped in there.
I suppose you could try crushing it up and applying it as weathering to freight cars and buildings. I don't know what would happen when you spray it with flat finish like Dullcote, but it should be OK. I use powdered charcoal from the art supply shop for weathering, and seals in with no problems.
I suppose you could try crushing it up and applying it as weathering to freight cars and buildings. I don't know what would happen when you spray it with flat finish like Dullcote, but it should be OK. I use powdered charcoal from the art supply shop for weathering, and seals in with no problems.