Revealed: How to pour the perfect pint of Guinness this St Patrick's Day, according to science

UK Daily Mail ^ | 3/17/2026 | William Hunter

[fruser1]

A cool, refreshing pint of Guinness is a traditional and delicious way to celebrate St. Patrick's Day.

But coaxing out the perfect cascade of lively bubbles and a thick, creamy head is an art that puts even the best bartenders to the test.

Now, scientists have revealed the exact method for pouring the perfect pint of stout.

And they agree that the famous 'two–stage pour' is far more than just a marketing gimmick.

However, experts say there is no magical perfect time to let your pint rest between pours, with exact timing coming down to the sharp eye of an expert barkeep.

Dr Andrew Alexander, a chemical physicist from the University of Edinburgh, told the Daily Mail: 'The pause allows for the bubbles rushing around in the liquid in the first step to calm down, rise to the top, where they end up at the foam at the head.

The secret to the perfect pint of Guinness is understanding the unique physics of the thick stout's fizz.

Rather than being pumped with carbon dioxide like fizzy lagers, the black stuff gets its subtle bubbles from nitrogen.

[major_gaff]

At 32 degrees F, the Guinness is too cold to be tasted properly. That temperature is
reserved for Bud and all other mass-produced American crap beers. This is by design
so that you cannot taste how truly shitty they are. Slainte!

[Arlis]

That may be true, but I cannot imagine beer at 42 deg.

That’s almost coffee/tea temp for me!

But next time at a bar I’ll try it.....

[major_gaff]

Yeah, I used to feel the same way, but good beer is very complex, just like a fine wine...if
it is too cold you can't taste it. Also, make sure that you are at a place where they serve it
at the correct temperature...most bars serve it too cold because it is in the same keezer as
the rest of the beer on tap.

[Arlis]

True story. When in college I and a few underage friends were a a bar commenting on the difference in beers.

The bartender laughed heartily and said something like, “You idiots! YOU KNOW NOTHING ABOUT BEERS! I can set 4 different beers of your choice in front of you for free and I GUARANTEE YOU CANNOT TELL WHICH IS WHICH!

He did just that. And sure ‘nuf - none of us could tell one from another!

I’ll never forget that!

[major_gaff]

Nice. College was where I learned to drink good beer...there was a little drive across from
the engineering buildings that I spent a considerable amount of time in when not in the
labs. They had a lot of Belgian, German, and UK beers on tap served at cellar temperature.
This was just before the craft brewing industry took off, so we had nothing like those styles
made in the US...all part of my University education.

[Arlis]

I never learned to drink good beer there. Just a lot of beer. Nuf for rest of my life. Almost.

[Arlis]

I never learned to drink good beer there. Just a lot of beer. Nuf for rest of my life. Almost.