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Health
Blood Types
Blood
Veins

Is blood blue or red?

Answer

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Wiki User
February 01, 2012 12:42AM

Blood that contains hemoglobin (such as in humans and other vertebrates) is always red. The reason veins appear to be blue is due to the lack of oxygen. If you hold your hand up to a light source, your hand will glow red because of the blood being red.