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Is blood blue in the vain?

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Anonymous

15y ago
Updated: 12/18/2020

Blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue

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slandsolots

Lvl 2
4y ago

What else can I help you with?