The dark blood in the vein absorbs most of this red light (as well as any blue light that makes it in that far), so what we see is the blue light that is reflected at the skin's surface. This is due to the way that different colors of light travel through skin: blue light is reflected in the surface layers of the skin, whereas red light penetrates more deeply. However, deep purple deoxygenated blood appears blue as it flows through our veins, especially in people with fair skin. Deoxygenated blood is deep purple: when you donate blood or give a blood sample at the doctor's office, it is drawn into a storage tube away from oxygen, so you can see this dark purple color. Diversity, Equity, Inclusion, and AccessĮver wondered why blood vessels appear blue? Oxygenated blood is bright red: when you are cut, the blood you see is brilliant red oxygenated blood.Exploring the Structural Biology of Bioenergy.Exploring the Structural Biology of Cancer.
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