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Happy #StPatricksDay! 
What makes the bubbles in a glass of Guinness fall, and what gives the beer its dark colour?
This graphic in C&EN has the answers: https://cen.acs.org/articles/93/i11/Periodic-Graphics-Chemistry-Pint-Guinness.html
@compoundchem A suggestion that perhaps St. Patrick's Day could contain information about something other than alcoholic beverages (even the bubbles therein)?
Perhaps about why carageenan derived from Irish moss is used as an industrial food ingredient and the chemical structures that make it useful for that purpose?
@ml absolutely, but this is what I have a graphic on currently – my time for new graphics is quite limited at the moment. C&EN do have a good article on the green dye added to some US rivers which I was going to link on some of my profiles later!
Also, I'd guess your original post could apply to Guinness Zero too?
@compoundchem Thanks. I certainly was not expecting an instant graphic and was making a suggestion for next year.
It's always a problem of stereotypes, but at this time of year there's a fever pitch of associating anything Irish with alcohol.