these are all good ideas, the bubble one is the most interesting, but overall performance would be equal or worse to that of phase change. Btw, the nuclear sub only blew up because it set off one torpedo, consequently setting off the others... Also, pharmacy peroxide is 5%. If you want to see it react, put in a sealed container with red blood cells or potato sliced up. THe container will eventually explode. M&Ms minis tubes work well for a type of time delay grenade. Slice up some potato, fill the tube with peroxide, then put in the potato and close the lid. Sit it somewhere where it is sure to spook somebody when it goes "bang".
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