So I've got a 4pack of Young's Choc Stout in a can. And it came with a nitrogen widget inside.
I noticed when I took the 4pack out of the fridge today that the bottom of all the cans are convex, not concave like a normal can. The beer appeared to pour normally, with a 3/4 glass head that slowly formed into a 1/2in permanent head. It's slightly "fizzy", but nowhere near what a CO2 based beer would beer. It's definitely not flat.
Is this just a case of the ball inside letting out the CO2 during say the ride home and should I even be concerned?
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Thread: Nitrogen widget in stout