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On Sun, 27 Jun 1999, Fredrick Rea O'Keefe wrote:
Rumor has it that New York's Ballentine Beer used to add "soap" to their
brew to make a longer lasting head - their claim to fame. (Or was it
Rheingold?)
According to an old source at Dow Chemical, a favorite, common additive
to American beers to stabilize the head, is methoxy cellulose .. a polymer
surfactant that alters the surface tension and stabilizes the foam.
John N. Cooper