flash paper! Answered
this idea came from cartoons so bear with me.
i have seen some flash powder instructables but not any flash paper ones (or so i think)
using tetranites flash powder (https://www.instructables.com/id/Flash-Powder/) and mix with the idea of making paper (http://www.pioneerthinking.com/makingpaper.html)
if you substituted "recycled paper" with flash powder could you make a flash paper that would ignite with a poof when lit.
my conclusion is that the sponge would absorb the water along with the powder, but adding flash powder after making the paper while its still "wet" in step 9 add a layer of powder and sandwich it. maybe have one end without powder to make a rough fuse.
i dont know what do you people think?