blood it’s red, any surgeon will tell you that your veins are red too. But you see them blue through the skin, and that depends on several factors.
If you’ve been wondering why your veins are blue, when you look at them through your skin, even though you know they’re actually red, now you know the answer. It depends on a number of factors, including how your eyes perceive color, how light behaves when it comes in contact with your body, and the special properties of blood.
The distance from one end of the light to the other is called the undp length, and the different colors of light have waves of different lengths. The red light has a long wavelength, about 700 nanometers, the purple light has a short wavelength, about 400 nanometers, and the rest of the spectrum is divided.
See why your veins are blue, even though your blood is different!
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