Why? Because Firearms History at blogspot.com has spent most of 2016 doing a deep dive into the history and technology of black powder, starting with the raw materials, and working their way up to industrial production.
A look at as much of the archive menu as we could screencap shows you what we mean. Open up these archives, go to the bottom and find “What is a Saltpeter Man?” and work your way up, if you’re at all interested in how gunpowder — original, black, gunpowder — was and is made.
It’s a priceless resource. There is no other place where all this information is available in one place. It’ll be even better if he follows up with the early history of smokeless powder, which saw simultaneous development of multiple technologies in multiple industrial nations.