Boiling systems and foams
Development trials for new boiling systems have shed new light on the issue of foam. The numerous analyses made in the last few years in order to test new technologies have shown that many common assumptions on the topic of foam are difficult to put in practice.
The level of coagulable nitrogen has hitherto been the parameter for good or poor beer foam. However, it should at most be used as an indicator.
A high value for coagulable nitrogen in cast wort is no guarantee of satisfactory foam indices in the finished beer. A low value is just as unlikely to result in poor foam indices. With a coagulable value of 1.3 mg/100 ml in the cast wort, foam indices of over 130 Ross & Clark (R. & C.) can still be obtained. By contrast, coagulable N values of 2. & C. 1 and 2).
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