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The blood of a horseshoe crab is blue, it's not deep, it's more of a pale blue. It's blue rather than red like ours, due to the presence of haemocyanin in the blood cells, instead of haemoglobin.

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11y ago
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11y ago

The veins appear dark blue due to the way the fat in your skin scatters the light that passes through. The deoxygenated blood inside the vein is dark red.

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13y ago

Venous blood is dark red.

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Q: Why is blood a dark blue color?
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