The crimson color is a dark shade of red that resembles the color of human blood (which consists of oxygen-rich red erythrocytes, white leukocytes, and yellow blood plasma). It is precisely the iron contained in hemoglobin that gives blood its red colour. The actual color ranges from purple to dark brown depending on blood oxygen levels and may have a slight orange undertone. Deoxygenated blood, which circulates closer to the surface of the body and is therefore generally more readily visible than oxygenated blood, leaves the body’s veins in a dark red state, but oxygenates rapidly upon exposure to air and takes on a duller red hue. clear. This happens faster with small amounts of blood, such as a needle prick, and less quickly with cuts or punctures that cause increased blood flow, such as a basilic vein puncture: all blood removed during a phlebotomy procedure is deoxygenated and, generally, it is. T. have the opportunity to replenish themselves with oxygen when they leave the body. Already oxygenated arterial blood is also a lighter shade of red: this is blood seen in a pulsating wound on the neck, arm, or leg, and it doesn’t change color when exposed to air. Therefore, the color “blood red” covers these two states: the darker oxygen-poor color and the lighter oxygen-rich color. Additionally, dried blood often has a darker, rust-colored quality: all dried blood has become oxygenated and then dried, causing the cells within to die. This blood is usually darker than any shade of red seen in fresh blood. In the RGB color spectrum, blood red often consists of the color red alone, with no green or blue components; in the CYMK color model, blood red has no cyan and consists only of magenta and yellow with a small percentage of black. It is often darker than brown or dark red.