how to make burn/ blast marks?

how to make burn/ blast marks?
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Custom WorkstationI have a movie iron man figure, and its paint has some wear in places..instead of repainting it I thought of adding a big black burn/blast mark on him...like in the first movie when the tank shoots him down and he gets up with the blast mark on his chest.
so any advice or tips on how to get the burnt look? without setting fire to it

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