The blood in your veins appears blue because you are looking at your veins through layers of skin and fat
Skin scatters a lot of the red portion of white light before it can reflect off the blood, leaving the blue light to reflect off the blood and back to our eyes. It is a similar effect to how the white sun appears red at sunset due to the blue colors being scattered away by the atmosphere.
Daniel33 answered the question on March 21, 2022 at 09:25
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