8-80 ammoinia and iodine crystals. make in a paste, apply and allow to dry. it is safe to handle while moist. touch when dry and BANG. You didn't get it from me, ok.
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You can learn all the details on touch powder (nitrogen triiodide, NOT ammonium triiodide), including how to actually make the ingredients (not just use the ingredients to make it, actually make the ingredients from obtainable sources) from a book called Shenanigans: An epic guide by Jared Smith. It also has other mad stuff in it like making fireworks and lock picking etc.
not to be rude or anything, but what the hell is touch powder?
the stuff that explodes when you touch it?
Possibly ammonium iodide?
in that case here