When you get a cut your blood usely looks red. but in the inside it could be any color. it could be blue, yellow pink, purple, orange! but there is really no way of figuring out cuz if yo cut someone up there blood would touch the atmosphere it changes to red. i hope this answer help u!
EDIT-
Actually deoxygenated blood is dark red in colour, many maintain that it is blue but this is just a common misconception NOT supported by fact, It is biochemically impossible for haemoglobin to turn blue.
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Oxygen poor blood is red. It's just a darker red than oxygen rich blood. There's a common misconception that blood in the human body is blue. However, this is far from the case. It's just a much darker red.
De-oxygenated blood is called "hypoxemic". This may be either because the body is not taking in enough oxygen for some reason, or that the blood is "venous" blood which is returning to the heart. Once passing through the heart, it moves to the lungs where the carbon dioxide passes from the blood into the air sacs of the lungs and then is exhaled from the body, and the blood "picks up" oxygen, sending it out to the body via arteries.
Your blood is actually always red! Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues.
it's blue when it flows in your blood stream with little oxygen it turns red when the blood has contact with more oxygen