The blood is always red, some people say that the color is blue until it hit oxygen but NO. The blood is flow through your body red. Have you ever looked at the sun and put you hands over your face, the color is Red.
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Blood with oxygen is bright red. Blood without oxygen is dark red or maroon.
It is a common misbelief that blood or veins are blue. Neither of them are never blue (see the link provided). Veins do seem blue through the skin, but it is related to how different wavelengths of light reflect and how brain processes information.
When blood is inside your body it is blue. It changes to red when it leaves your body when oxygen touches it.
That's not correct. It is always red, although the oxygen in it turns it lighter. It is never blue - that misunderstanding arises from the apparent colour of veins visible through the skin and subcutaneous fat.
It's still red... Actually no the previous answer was wrong. When blood dries it turn brownish because the iron oxidizes.