Nitrogen triiodide NI3 (exploding purple paste) has a reaction from 2NI3 ? N2 + 3I2, ok there was no bang or smoke, but paint some onto an object let it dry, and a slight knock or tap will make it go bang almost "Magically"
or
KMnO4 + C12-H22-O11 add a drop of H2O and with in ten or so seconds you have fire.
Crystalline disaccharide (sugar) C12-H22-O11
Potassium Permanganate = KMnO4
Water=H20
Add some of mix of first compound to the paper and the sweat from your hands would add enough water to make the compound burst in to flames, in about ten seconds.
Or add a tissue to the bundle of news paper, (not hard to do, its just a simple slight of hand), and sweat will do the rest.
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Thanks for the explanation Tadpole. Do you know if those chemicals are synthetic or can they be derived from nature? you can probably guess where I'm going with this
If they do occur in nature then could they not be gathered and used to fire start?