Under normal light,blood appears red because most colors are absorbed except red,which bounces back from the blood.Every color but red is absorbed by the oxygen-carrying pigment haemoglobin (Hb)

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Your blood is actually always red! Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues
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The color of veins depends on the color of blood it carries. For example : Red color blood is carried by veins and its color is red.
Red and blue
are the color of veins