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Potassium Nitrate ToothpastePosted on April 10, 2010. Instead of using potassium nitrate powder can I use a toothpaste that contains KNO3 with sugar to make a smoke? Can I do to make smoke bombs. But toothpaste contains potassium nitrate 5%. What should I do to increase the percentage of potassium nitrate? 5% is not enough for anything. depending on what else is in your toothpaste, there are different ways to purify. but it is probably cheaper to buy online the book. its around 10 dollars per pound. CommentsHarry says... Stupid Posted on April 29, 2011 Leave a Comment | Popular My Friends |