What chemical element gives the blood of a lobster a bluish tint?

Because of the presence of the chemical element copper, lobster blood has a bluish tint. The blue colour is caused by hemocyanin, a copper-containing protein that acts as an oxygen carrier in many arthropods, including lobsters. 

The copper in hemocyanin binds to oxygen molecules, and when the protein is oxygenated, it gives lobster blood its distinctive blue colour. Blue blood is not unique to lobsters; other arthropods that use hemocyanin as an oxygen carrier also have it. The bluish colour of lobster blood is not due to freshness or quality, but rather is a natural feature of the species.

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