Wikipedia says the main one is the Fischer-Saller scale, which unfortunately was made by Nazi eugenicists, which explains why over half the scale is different shades of wheat-blond. (Interestingly, at least in the Wikipedia version it uses "chatain" for light-medium brown and "brunet" for dark brown! Didn't realize I was using the Nazi divisions, maybe I should switch to your scale.)
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Wikipedia says the main one is the Fischer-Saller scale, which unfortunately was made by Nazi eugenicists, which explains why over half the scale is different shades of wheat-blond. (Interestingly, at least in the Wikipedia version it uses "chatain" for light-medium brown and "brunet" for dark brown! Didn't realize I was using the Nazi divisions, maybe I should switch to your scale.)