This misconception may have come from the green-blue appearance of veins
Another reason I thought could be cyanosis gives rise to bluish discoloration of the fingers, which might have lead to people wrongly assuming less oxygen means blue.
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Yeah this could be true, you're right! Fun fact, central cyanosis can also lead to a dyscolouration of centrally supplied mucous membranes, such as under the eyes and tongue!
Yeah the tongue is a big differentiator between peripheral and central cyanosis xD