Official line...
Adored since 1959, it's the powerful surge and settle that gives Guinness Draught beer its uniqueness. Lovingly poured around the world, Guinness Draught is Ireland's best-selling beer and No.1 export.
A unique mix of nitrogen and carbon dioxide helps create Guinness Draught's liquid swirl that tumbles, surges and gradually separates into a black body and smooth creamy head.
Independent description...
Both black and red all at the same time. Nitro head is thick and creamy. Excellent head retention and lace. You can count the rings as the pint disappears. Aroma is not that strong, but there are some slightly bitter and coffee notes. Taste is mild and malty at first with great bitterness at the end. Very dry. Mouthfeel is great on nitro. Creamy head adds a depth of body.
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