So I finally found MSDS info on our Potassium Nitrate source. It is 99% KNO3, 1% Calcium Stearate.

I know that Calcium Chloride is a fire suppressant, and since Calcium Stearate is also a calcium salt, does it have a similar effect? If so, it's going to be a pain to remove, since it is also a crystal.

As always, thank you everyone!