these are some what less related  to the balloon project, i was initially considering them as possible fuel for the balloons but it never got developed to a functional point.  each video shows a combination of .6ish grams saltpeter and .3-.5ish grams of sugar.  i used powdered sugar, white granulated sugar, and natural sugar.  the sugar is the actual fuel of the reaction, the saltpeter is an oxidizing agent.