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I read that hydrogen disassociates from oxygen when magnesium oxidizes in the presence of water. Back in Germany, I put the metal powder from ten or fifteen MRE heaters in a black garbage bag. It about half inflated, but then the hydrogen escaped.
Back home, I think I put the metal powder from two heater pouches in a jar with a hole in the lid, added water, and lit the gas. There was a small flame for a surprising long time.
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