Okay, it looks like I'm half wrong, half right. Memory alpha and beta stipulate copper based blood. My mistake. But there are some conflicts as well. In the ENT novels The Good That Men Do through The Romulan War part II, Charles Tucker, working undercover disguised as a Romulan, has to keep taking sulfur peptide drugs, or something like that, to keep his blood green. That, and copper based blood really is blue. Look at the wikipedia entry for Hemocyanin. Sigh; it looks like I found a flaw in the Trek-verse. Oh well. I'm still looking forward to battling these ugly things.