Those who remember the famous (or perhaps infamous) Nitrogen Bubble Debate may recall that at the time that thread was active I was measuring the N2 content in a stout but the keg ran dry and I had to tap a new one which I store with just 1 vol CO2. Several weeks later (under 25:75::CO2:N2) I checked the gas content of the foam bubbles and it now stands at 14% N2, 86% CO2. This is more or less in line with the Guiness design IIRC.
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