this post was submitted on 13 Oct 2025
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Blood is blue until exposed to oxygen (lemmy.dbzer0.com)
submitted 4 days ago by Stamets@lemmy.dbzer0.com to c/whitepeopletwitter@sh.itjust.works
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[–] RememberTheApollo_@lemmy.world 12 points 4 days ago (2 children)

Thank all the medical and educational texts that chose blue to identify veins returning to the heart with a blue color and arteries away from the heart as red. A simple color choice to differentiate and somehow someone decided that this was the color of blood.

[–] odelik@lemmy.today 22 points 4 days ago (1 children)

It doesn't help that some blood vessels close enough to the surface of the skin can appear blue.