Cotton badding. My wife had a ton of this. Took it outside, broke it up into decent sized pieces, stretched it out. Srpayed light coating of black over it being sure to leave the whitish gray underneath. Then the kids and I gently dabbed orange, red, and yellow in upstrokes from the bottom.
Made a bunch smoke/explosions. My middle daughter makes me put some down every time a plasma gun goes off. Not to mention the vehicle wrecks. Also can be used to simulate a burning building.
Cheap, easy, fun to make.
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