Purple Blood Stain
Some marine arthropods have a blue copper based oxygen carrier instead of the red haemoglobin. Known as haemocyanin, the substance is suspended directly in the haemolymph and are not bound to blood cells.
Under cold conditions with low oxygen concentration, haemocyanin is more effective than haemoglobin at transporting oxygen.
Jerry Kirkheart on Flickr

Purple Blood Stain

Some marine arthropods have a blue copper based oxygen carrier instead of the red haemoglobin. Known as haemocyanin, the substance is suspended directly in the haemolymph and are not bound to blood cells.

Under cold conditions with low oxygen concentration, haemocyanin is more effective than haemoglobin at transporting oxygen.

Jerry Kirkheart on Flickr

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