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Mostly a very dark brownish red, although when you look at them through many people's skin, they look blue. This is an illusion, caused by the reflective factors of the skin, that gives the appearance of blue. This pertains to the veins themselves and the venous blood; both look blue through the skin. Deep bruises look bluish red for this reason, we can see more of the red color since the blood of the bruise is closer to the surface than veins, that look very blue through the skin. The arteries are much deeper in the tissues where they are less visible and have less of the reflective factor involved, but they are also red. The blood in arteries is a brighter red than the brownish maroon color of venous blood. During vascular and endovascular surgery and direct visualization, the true red colors are visible.

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