"…"
"…"
Looking at the green-skinned creature scratching its butt and smiling strangely, Kang De was silent.
…There was actually nothing wrong.
Before science improved and discovered a more effective chemical synthesis method, for hundreds of years, the gunpowder made by humans was basically very smelly. The composition of gunpowder was sulfur, charcoal, and saltpeter. The former two were basically everywhere and could be easily mined and made. However, natural saltpeter was extremely rare and could only be extracted by artificial methods… The key was in the word "manual".
There were many salt and alkaline lands in China. There was a relatively rich saltpeter mine. Coupled with the soil method of scraping the soil and refining the saltpeter, the smell was not too strong. However, there was nothing Europe could do at that time. They could only think on the toilet for hundreds of years. For this, many praiseworthy stories happened.