Good crema is extracted in a colour tone that ain't too light, nor is it too dark. Good crema doesn't guarantee good espresso, but it does tell you how well the extraction process has been done. A light coloured (like the creamy clover honey) crema usually signifies a short extraction, around 15 seconds, while a tiger flecking texture (like the reddish brown fur of Sumatran tiger) indicates well extraction, around 25 seconds. If you observe a dark and burnt coloured crema which is not distributed evenly on the surface of the espresso, it normally shows over extraction, which exceeds the maximum extraction period, resulting in an overly bitter cup.
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