Left to right:
1) standard quality KNO3
2) fine quality KNO3 (using conventional coffee grinder)
3) fine quality KNO3 with 2% red iron oxide
Same sequence in movie
Grinding results in a smoother burn, but did not increase burn rate dramatically.
Grinding results in a suspension that is no longer pourable.
Addition of catalyst improved burn rate by a factor 2.
Addition of catalyst improved burn rate by a factor 2.