Veins appear blue because of the way light interacts with the skin and the blood inside the veins. The color of blood is actually red, but when light passes through the skin, it gets absorbed by the surrounding tissues and only certain wavelengths of light are able to penetrate through. The longer wavelengths of light, such as red and orange, get absorbed more easily, while the shorter wavelengths, such as blue and green, are able to penetrate deeper into the skin. As a result, when we look at veins close to the surface of the skin, the blue light is reflected back to our eyes, making the veins appear blue. However, if you were to directly observe a vein, such as during a medical procedure, you would see that the blood inside is actually red.
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