Re: Theory?
> originally 100% proof alcohol was concentrated enough that black powder would still ignite if soaked in the stuff
It's not "% proof", just proof or degrees/° proof, 100% alcohol is 175°, that's 75° over proof.
> Oh for the days
It's still not difficult to make your own black powder, 'though you can't walk into a chemists' shop like I did as a kid and walk out with three twists of paper containing charcoal, potassium nitrate and flowers of sulphur.