RAINBOW BODY
Why are veins blue?
WHEN you look through the skin, it appears our veins are blue — but this is a trick of the light.
The blood carried by veins is more of a purple-maroon colour because it has lost its oxygen. But it looks blue because the colour has a shorter wave length, meaning it travels through the skin quicker than any other shade.
Scientists in Toronto mimicked the effect by filling transparent tubes with blood. Then they submerged the tubes in a milkcoloured solution to simulate lightcoloured skin.
They found that although the tubes were red, when they submerged them further they suddenly looked blue.