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The Science Behind a Perfect Pint of Guinness

Staten Island, N.Y., USAWednesday, January 28, 2026
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Ever wondered why a perfectly poured Guinness looks so good? It's not just luck. It's all about the science and the technique.

The Right Glass

  • A clean, dry Guinness glass with the harp logo is key.
  • The harp helps you know when to stop pouring.

The Perfect Pour

  1. Angle the glass at 45 degrees.
  2. Pour until the liquid hits the harp.
  3. Set it down and wait for about 119.5 seconds.
    • This lets the nitrogen work its magic.
    • The foam darkens, and the beer turns a deep black.
  4. Top it off by pouring the rest straight up.
    • This builds that famous creamy head.
    • No big bubbles, just a smooth, velvety top.
  5. Serve it with the harp facing the guest.

The Secret Ingredients

  • Guinness uses a special mix of nitrogen and CO2.
  • This makes the beer smoother and different from other draft beers.
  • The kegs need to rest before tapping.
  • They should be stored and served at just the right temperature.

A Legacy of Excellence

  • The history of Guinness goes back a long way.
  • Arthur Guinness signed a 9,000-year lease in 1759.
  • This started a legacy that continues today.

So, the next time you see a perfectly poured Guinness, remember it's not just a beer. It's a mix of science, art, and history.

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