Deoxygenated blood is really a darker shade of red; this is present in veins, and may be observed in the course of blood donation and when venous blood samples are taken. It is because the spectrum of light absorbed by hemoglobin differs in between the oxygenated and deoxygenated states.[35] https://como-fazer-wing-5-mu-onli85295.frewwebs.com/36803653/the-blood-castle-mu-online-diaries