Dr. Diesel-
Are you talking about using straight CO2 on a keg of Guinness?
The instant 100% CO2 hits that keg of Guinness it is ruined. There is a reason Guinness needs a 75N / 25CO2 mixed gas.
Guinness has a very low internal CO2, it is made with N. Putting anything more than a 75N/ 25CO2 ruins it.
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