HOMEBREW Digest #6015 Thu 14 March 2013
FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
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Contents:
Iron in Beer (Paul Edwards)
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Date: Thu, 14 Mar 2013 07:37:35 -0400
From: Paul Edwards <sdrawdep7821 at sbcglobal.net>
Subject: Iron in Beer
A poster the other day asked about what George Fix had said about iron in
beer in one of his books. So I looked it up
In "Principles of Brewing Science", page 46, Dr Fix says that yeast requires
TRACE amounts of copper (0.012 ppm), iron (0.075 ppm), and zinc (0.5 ppm).
He goes on to say that most all-grain worts tend to be sufficient in all
three, and that excessive amounts of these metals can lead to other problems.
Nothing at all is said about foam.
Others have noted what happens when iron gets above trace amounts.
- --Paul Edwards
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End of HOMEBREW Digest #6015, 03/14/13
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