SIGNIFICANCE OF<i>ISO</i>HUMULONE AND CERTAIN METALS IN GUSHING BEERS

Abstract

Nickel or iron, though only in association with isohumulone, will contribute to overfoaming in beer; cobalt, alone or with isohumulone, will not. Thus, whilst these three metals all increase foam stability and in fact, when present, become concentrated in the foam, cobalt differs from the two others in its relation to overfoaming.