Originally Posted by unionrdr
...would've been interesting to see if it can actually be measured visually.
That would be interesting, though I don't think the measurement would have much meaning...i.e., you couldn't use your new
OG to calculate ABV, since it changed your dilution of original wort/beer.
Think about if you added another gallon of water then took a reading - "holy smokes, my FG dropped! +2% alcohol!" Of course not, you just diluted it so your ABV drops.
The only reason the OG/FG works for alcohol is because the only
density change is sugar to alcohol - if you add any other liquid without controlling for it, your measurements won't mean anything.
Just thinking out loud here.