3 ms·
That's just an optical effect caused by the fact that the veins are (normally at least) underneath the skin. Even oxygen poor blood is not blue.
by jeroen94704 13y ago
That's just an optical effect caused by the fact that the veins are (normally at least) underneath the skin. Even oxygen poor blood is not blue.
- dhughes 13y agoYeah I figured something like that. I found this very detailed explanation, in a nutshell skin scatters light. https://www.imt.liu.se/edu/courses/TBMT36/pdf/blue.pdf https://www.imt.liu.se/edu/courses/TBMT36/pdf/blue.pdf And this list of animals with actual blue blood, when its healthy and oxygenated not de-oxygenated: http://www.buzzfeed.com/donnad/10-animals-that-bleed-blue http://www.buzzfeed.com/donnad/10-animals-that-bleed-blue