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I can think of several essentially dry combinations that will provide pop but not in ways that wouldn't draw the attention of the ATF. At least not a chemical "pop" (read: explosion)
If you want to get pop by creating gas that overinflates a container that probably means a CO2 producing reaction since most of the other easily produced gasses are toxic (I'm assuming you don't want to end up with an ammonia cloud), and all I can think of still involve a liquid. I'd also think that if only dry components were involved the reaction would likely be too slow to produce a dramatic effect.
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