Potassium nitrate, the oxidizer in black powder was originally gotten from farm animal waste ( they hit a jackpot if they found a cave full of bat guano). I knew they corned BP with a liquid and then dried it in the sun then broke it up in different size grades to get better performance.
Didn’t know they used urine for Corning
I read in The Gun Digest that the urine of wine-drinking monks was highly prized by powder makers.
**Didn’t know they used urine for Corning***
I have the book THE AGE OF FIREARMS by Robert Held. In it, he mentions the use of urine for corning black powder. It was said the urine of “a wine drinking Bishop” was best and often given out as an Ecclesiastical favor.