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Warning: people in coffee groups keep saying dark roast has more caffeine, and my $12 scale disagrees
I weighed out 18 grams of the same bean at two roast levels last month, and the lighter roast consistently pulled a stronger shot on my Gaggia. The claim that darker equals more caffeine comes from measuring by scoop, since darker beans take up more space, but by weight the gap mostly closes. So which side do you land on: dose by weight and stop worrying, or is there real chemistry here I'm missing? Tell me what your own scale and taste buds have shown.
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