Colour changing blood from red to green

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Did you know that your blood seems to be green underwater?


If somebody cut your hand (or accidentally a shark
bite) under 30 feet deep water, your cut bleeds a bright emerald green color. If you bring closer to the surface, it turns brown, then pink, and finally red at the surface.

Did human blood really change color like chameleon?

The blood doesn't change color. The changes are made by the light. If you are a science student you may know that White is made up of all color like red, orange, yellow, green, blue, indigo, and violet. White paper looks white because light (all 
the color) from the sun are reflected back from paper to our eyes, it emits all the colors. Red apple looks red because red light bounces off it, and all the other colors are absorbed. A black object is black because all the colors are absorbed and no light reflects into our eyes. We might know that different colors of light travels at different speeds (that's why red color is used in traffic signals because air molecules in atmosphere can't resist the red color due to its highest wavelength and scattered the least). If light enters the water the first color to be filtered out by water is red (water molecules are opposite to air molecules that's why it is filtered out). That means that at below 30 feet or so, there is no availability of red light to reach our eyes. Instead green(complementary of red color is green) is reflected due to green pigments in the blood. If you even went deeper the blood would change from green to black.

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