I'm sure most folk are aware that alcohol 'proof' came about by mixing the suspected spirit with about an equal amount of gun powder and if it burned then it was 'proofed', that is, the alcohol content was confirmed.
Booze 'proofed' this way was about 100 proof or 50 per cent alcohol.
https://en.wikipedia.org/wiki/Alcohol_proof
Booze 'proofed' this way was about 100 proof or 50 per cent alcohol.
https://en.wikipedia.org/wiki/Alcohol_proof