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Actually Tophat, (btw I love your avatar, one of my favorite episodes), Guinness uses roasted barley and that is why the head is so white. Black patent malt is, as the name suggests, made of malted barley and Maillard reactions that occur during malting black patent malt results in much more pronounced burnt and 'roasty' or coffee flavors and a darker head on the beer.
In the past the use of black patent or roasted barley is what differentiated a porter from a stout, but that line has been blurred over the years.
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