Smoke Bombs


Recently, I made a batch of smoke bombs using potassium nitrate, sugar, and baking soda (to regulate reaction speed). My first batch took about four days to dry which seemed odd, however, they produced a fair amount of smoke. For my second batch, I decided to put the potassium nitrate I synthesized from ammonium nitrate and potassium chloride (not the purest form of potassium nitrate, but it's all I had :/) into the oven on low heat to completely dry it out. After about ten-fifteen minutes the KNO3 was dry and I mixed it together with sugar (omitting the baking soda this time), however, the mixture never fully congealed. When ignited, the semi-congealed mass produced a fairly large amount of smoke and then caught fire. Can anyone tell me what I did wrong?
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Sorry, we don't discuss pyrotechnics here.

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