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Slightly. Blood is always red (common misconception is that it is blue). But when blood binds to oxygen it gets slightly darker red. It is always red because of the porphyrin in the heme group. The heme group in hemoglobin (the protein responsible for transporting gases in the red blood cells) consists of a porphyrin and an Iron ion. Another misconception is that the Iron causes the blood to be red, but it is the organic molecule Porphyrin that does this.

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14y ago
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10y ago

It is a common myth that blood is really blue. Blood is always red but the deep richness of the color is affected by how much oxygen is found.

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13y ago

The color of blood is BLUE before it touches air.

Freaky right

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Q: Why color is the blood?
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