From the HBD Archive
From: hplabs!utah-cs!cs.utexas.edu!raven!rcd (Dick Dunn)
Subject: color, yeastiness
Date: 1989-02-25 07:57:45 GMT

Jay Hersh wrote, in response to a couple of my comments:
> 2) The wavelengths which destroy beer flavor are 400 - 520 nm. Ref.
> The Practical Brewers, Master Brewers Association of America, Madison, Wis.

Hah! We got 'em now, man! 400 nm (aka 4000 Angstrom) is deep violet, but
520 nm is in the middle of green--if you had to give "the" wavelength of
green light, you'd say either 520 or 530. Surely this suggests a guilty
verdict on green bottles, which obviously pass light at this wavelength.
Now I'm curious about brown bottle glass, though...green is visibly bad
magic if your beer is going to get much exposure to light...but what's the
transmission spectrum of brown glass? (What ah'm a gettin' at is, would
one of you kind folks who have access to the equipment please break a brown
bottle and stick a piece o' the glass in front of a spectrum laid on a
density wedge, take a picture and tell us what it looks like?)

> 3) I once again vociferously concur (oooh big words) ...
Don't try this at home or over an open beer mug.

[yeastiness]
> 4) Oh Contriare Dick. Yeast definitely does impart flavor into beer. Maybe
> you phrased it wrong...

Ha, sure, I was just checking to see if you were on the ball! Very good!
But in fact, although I knew perfectly well what I meant, the rest of you
might not have. What I was really getting at is this: There is a flavor
and aroma which we call "yeasty", and it can show up in beer, BUT it is not
the result of not having aged the beer enough. There are off flavors that
yeast can contribute..and there are good esters it contributes too...and
some of these change with time. But beer which is (a) properly made and
(b) very young still does not have any sort of "yeasty" character to it.
In other words, a "yeasty" character to beer is NOT the simple result of a
properly-made beer that's too young. I suspect Jay agrees with what I
would have said if I'd said anything like what I meant, since he's clearly
in the Fresh Beer camp.

[Oh Contriare? Au contraire!]

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