Brewed a big Belgian beer last week. And using my refractometer (poorly, as it turns out), I wasn't able to get a solid reading of the OG.
Now a week later I've taken a sample of the beer and want to retroactively determine the OG using the current gravity, as determined by a hydrometer. Will this work?
My method was this:
- Get a hydrometer reading. In this case, 1.024.
- Take a refractometer reading. 11.1 brix.
- Using the MoreBeer refractometer correction worksheet enter the current refractometer reading on the first line.
- Enter various numbers for the "Starting Refractometer Reading" until the FG column for the 11.1 brix reading results in a gravity of 1.024.
Doing that gave me an OG of 1.079. This is much lower than I'd expect. According to the recipe and readings I was doing during brewing, my OG should be up in the 1.090s. That makes me think my method for retroactively determining OG is wrong.