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Frequently the answer is "blood is blue inside us and red when it hits the air". Blood carries oxygen in our body so this really doesn't make sense. Blood is red with arterial blood being brighter and venous blood being darker. Our blood vessels have a bluish appearance through our skin but just as water going through PVC piping isn't white, blood isn't blue.

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Wiki User

12y ago
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Wiki User

12y ago

blood when it is inside your body is blue.

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Anonymous

Lvl 1
3y ago
no it isnt. 
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Anonymous

Lvl 1
3y ago
You could prick your finger in a cup of vegetable oil. There is no oxygen in oil, so the red oxygenated blood would change to blue if the myth were true.

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Wiki User

10y ago

Human blood is red - whether that's inside or outside your body. It's that colour because of the haemoglobin present iin the 'red' blood cells.

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Wiki User

11y ago

Blue and green, it changes to red because of oxygen

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Wiki User

9y ago

Blue

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Q: What colour is blood inside a human body?
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