Is Blood Blue When it is in Your Veins?

No, blood is always a shade of red, but when in veins blood is a maroon shade. In diagrams, they veins are colored blue, so it is easier to see them. You may ask, "Then why do veins look blue when you can see them through your skin?" Well, it is just a trick of the light, but if you hold your hand under a light your hand is red, due to the blood in your veins and arteries, but you can't see any blue. -John Baskin