Well, the NC in the mixture will probably burn firstly (and maybe release the oxygen from the KNO3), then the heat will vaporize and ignite the
acetone, and the acetylene. Don't forget the additional oxygen provided by the wind - the ball will fly, not just burn standing still. I've also burnt
a 50/50 KNO3/sugar mixture recently, and although it was not ground and mixed very finely, the flame was mostly violet without a trace of yellow
color. As I burnt a mixture of acetone, with 25% ground KNO3 and about 5% silica (the acetylene was missing completely because I had no carbide left),
it burnt with a normal acetone flame, even without a purple trace from the KNO3 (only at the end, there was a small trace). But then, as I
accidentally set the spoon on fire where the rest of the mass was, and then I shaked the burning mass off the spoon, it showed a pure blue flame while
it was falling to the ground.
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