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Nov 17, 2018
Why superfacial veins appear greenish blue in color?
Dr. P●●●●i C●●●●●●l
Its a simple matter of absorption and reflection of light! Under normal light, blood appears red because as most colours are absorbed except for red, which is reflected back from the blood. Every colour but red is absorbed by the oxygen-carrying pigment haemoglobin (Hb). If a filter that blocks the reflected colour is positioned between the blood and the eyes of the person looking at the veins,
the perceived colour changes. In the case of humans, the skin acts as a filter for the colour red, and the colour is therefore is seen as green.
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Nov 19, 2018