The color of the blood is RED, the color of the vein is bluish
color, that is why it looks like your blood color is blue when you
look at them. If you heard of a story that your blood turns color
RED when your blood is exposed to oxygen, that is incorrect.
The determination of blood's color will depend on if there is
oxygen in the blood or not oxygenated blood is a dark red color,
the same color of the blood that comes out of am open scratch, Or
Blue if it has little to no oxygen at all