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Biggest pigmentation study about Greece is from 1879 by German Bernard Ornstein, later republished by Swiss Eugene Pittard on a sample of 1000-2000 soldiers. This didn't include the most distant islands, Northern Greece and Anatolian populations.
Bernard Ornstein
Eugene Pittard
Blondism ranges at ~8-10%, blue and gray eyes at ~22-27% and strangely black hair at ~0,3-2%(I guess strictly black?).
You have other studies giving various percentages but they are mostly small-scaled and perceptions of color varies.
The most recent one is this one.
Gives close results to Ornstein but it's based on a questionnaire and it's small-sampled.
Observing old Greek pictures and conceptions from the field of Ornstein's studies to modern Greek reality, I would say that ethnic Greeks today are on average of darker pigmentation than back then with a notable variance from person to person but maybe not as some stereotypes claim.
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