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47042Re: Correlation

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  • edbar44
    Aug 21, 2010
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      I filtered a small quantity of the wash and refrigerated it and let it sit for a week, readings were the same. At the same time, I stripped the wash that I had and reused the remaining, checking it for SG and Brix and the readings were the same. It has now been fermenting for 4 days and it has come down to 1.020 and 13 brix so apparently all the junk that's in the wash plays no significant role in these readings, the wash is still quite a dark brown since it has been stripped twice.

      --- In Distillers@yahoogroups.com, "edbar44" <edbar44@...> wrote:
      > That's probably the reason then because this is not a sugar wash although it was originally. I previously wrote about my stuck fermentation which I distilled out and got all the ETOH, then put it back in the fermenter and started the fermentation again. I was kind of shocked to see the Brix at 32 but the SG was at 1.110 ( I added some sugar)so I guess since it seems to be stuck again, I'll distill it again and perhaps ferment it again without adding any sugar. The mash is brown and smells almost like caramel and was told by Harry that this is what they make rum from but I only want the neutral. So at 1.045, how much sugar should be left in this mash?
      > BTW, I've used both the refractometer and the hydrometer on all my washes to monitor the progress and it seems pretty accurate, I usually get down to 8 brix with the SG of .992+
      > --- In Distillers@yahoogroups.com, "tgfoitwoods" <zymurgybob@> wrote:
      > >
      > > Edbar,
      > >
      > > If I read you correctly, you used a hydrometer partway through a
      > > fermentation, and got a reading of 1.045. That specific gravity can be
      > > interpreted at least 2 ways.
      > >
      > > First, if you have a solution of only simple sugars and water, you can
      > > expect very roughly a 6% ABV ethanol water mixture, if fermentation
      > > works to completion. If you test that simple sugar-water solution with a
      > > refractometer, you should see a Brix/Balling value of about 11.5, based
      > > entirely on the fact that the solution is simple.
      > >
      > > The other interpretation of that 1.045 SG is that if you have a solution
      > > of sugar, water, yeast cells, nutrients, ethanol, and some intermediate
      > > fermentation products, 1.045 doesn't tell you jack. Because a
      > > refractometer's index of refraction reading is also changed by the
      > > mixture of ethanol, water, and other stuff in a partially complete
      > > fermentation, the refractometer reading is also so badly skewed as to be
      > > worthless.
      > >
      > > In the middle of a fermentation, which is where I'm guessing you are,
      > > all that 1.045 tells you (and this is just from brewing-winemaking
      > > experience) is that, depending on the amount of non-fermenting sugars in
      > > your wash, you are probably not finished with fermentation yet. Again
      > > from experience, wine fermentation is easier to guess the finish point
      > > than beer fermentation, but nothing is chiseled in stone.
      > >
      > > The known-solution-content argument continues to the alcoholometer. If
      > > you finish fermentation with a real ethanol ABV% of 14, and drop your
      > > alcoholometer into that solution, it sure as hell won't give you a
      > > reading of 14%ABV. In fact, the alcoholometer does not really test for
      > > amount of ethanol; it only knows the SG of pure ethanol-water mixtures
      > > at different concentrations. When it sees a particular SG, it remembers
      > > what the ethanol concentration was in a pure ethanol/water solution for
      > > that particular SG and tells you that %ABV. When your mixture is 27
      > > kinds of junk in water, that alcoholometer doesn't have a clue.
      > >
      > > Did you get your Brix reading by using a refractometer partway through
      > > the fermentation? If so, that reading is worthless, because all the
      > > other garbage in that partial fermentation just confuses the bejeesus
      > > out of a refractometer, which can only measure index of refraction, and
      > > tell you what the Brix would be if that solution were pure sugar-water.
      > > Since that's not what you have now, the reading means nothing.
      > >
      > > For a couple of simple rules, believe the hydrometer (well, sort of)
      > > until you pitch the yeast, and believe the alcoholometer only after
      > > distillation.
      > >
      > > Zymurgy Bob, a simple potstiller
      > > --- In Distillers@yahoogroups.com, "edbar44" <edbar44@> wrote:
      > > >
      > > >
      > > >
      > > > I've got a batch fermenting and it's going real slow, just noticed
      > > something on a Brix chart that doesn't compute.
      > > >
      > > > My. SG is 1.045 but the brix is 22 which doesn't correlate or is
      > > something missing here.
      > > >
      > >
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