@compoundchem@mstdn.social The draught Guinness (nitrogen) is a 1950s innovation. Nor did Guinness invent stout, which is black even in the non-nitrogen traditional bottled version. Stout is mentioned in 1677. Guinness started in 1759. The nitrogen gives the creamy head on the draught and more recent "simulated" canned draught versions. Guinness moved HQ to London in 1932 and is not an Irish company. Also nothing to do with St. Patrick, but then neither have snakes or shamrocks (both late folk myth).