00:02your veins are not actually blue so why do they look blue under your skin inside your veins the
00:08blood is always red even when it has less oxygen arteries and veins look different in how they
00:13carry blood and how deep they sit under the skin light enters your skin and blue light reflects
00:19back more easily than red light that optical effect tricks your brain into interpreting the
00:24veins as blue on the surface if you cut a vein the blood is still dark red never blue
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