the.com/proof blend
Whiskey math where 80 proof vodka and barrel-strength bourbon make peace at 90.
means The act of mixing high-proof and low-proof liquors (or batches) together to land on a target strength, rather than using something bottled already at that proof.
from Not a historic idiom but a working-bartender/distiller compound: 'proof' traces back to old spirit-testing methods (like the gunpowder 'proof' test that confirmed alcohol content by whether soaked powder would still ignite), and 'blend' is just the plain English verb for mixing. Put together, the phrase is modern trade-speak — functional, not folkloric — for averaging strengths to a desired number.
- legal purpose
- evens out barrel-to-barrel alcohol variation before bottling
- water trick
- distillers add water, not magic, to hit target proof
- label clue
- blended whiskey often means proof-adjusted, not flavor-adjusted