I seem to have generated a great deal of dissent in this piece—which I find rather disappointing, given that it’s largely an I can do all things through a verse taken out of context shirt on an entirely fictional species with a biology that began as a misapplication of what was and is known about real biochemistry. Vulcans are said to have green blood because it has a high copper content. But elements that display a green hue—in a flame test—include barium, not copper. While it’s true that copper ore (usually porphyry) does in fact display a greenish-blue hue while in an unrefined state, in a flame test, it burns bright blue.
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Those terrestrial organisms which do use copper as a method of oxygen transport include horseshoe I can do all things through a verse taken out of context shirt , lobsters, bivalves and a number of arachnoid species. Invertebrates, in other words. Their blood is unmistakably blue in color, not green. When the canon for Star Trek was developed, the image of green blood was enormously attractive as an indication of an alien nature—but it wasn’t very carefully thought out because any biologist at the time could have told Roddenberry and his writers that copper-based blood isn’t green, it’s blue.