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potassium nitrate is perfectly safe- schools are allowed to use it ffs. the most harmful product of a sugar and KNO3 reaction would be K2CO3 which I would not recommend breathing in but like with most chemicals is isn't just one breath and you die.
sugar and kno3 can be melted in a crucible or pan- the you leave it to cool- then ignite the tablet outside when ready.
sugar and kno3 can be melted in a crucible or pan- the you leave it to cool- then ignite the tablet outside when ready.