Why does blood turn green underwater | Green blood | Sulfhemoglobin | Human green blood | Blood

If you see oozing blood 30 ft underwater, it appears bright green. But as you come nearer to the surface, the blood turns brown, then pink, and finally red at the surface. Why does it change colour? The blood doesn’t change colour at all. What changes is the light in the water. White light, like the light from our sun, contains all the colours in the spectrum: red, orange, yellow, green, blue, indigo, and violet.Different colours of light also travel at different speeds, and water slows light down. So as you dive down into the water, the first colour to be filtered out by the water is the slowest: red.That means that at 30 feet or so, there is no red light in the water, so red light can’t bounce off blood into our eyes. If you went even deeper, the blood would change from green to black.
Why does blood turn green underwater | Green blood | Sulfhemoglobin | Human green blood | Blood
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