I've been working on an alien species, and I wanted it to have a blood colour other than red. I was going to go with Coboglobin until I found the sites I was looking at providing diametrically opposite info.
The first one I looked at claimed that Coboglobin was best in warm, oxygen-rich environments, and was amber-coloured in the arteries and clear in the veins, and the second site I looked at claimed that it was best in cold, oxygen-poor environments and was clear in the arteries and amber in the veins. Obviously someone got it completely backwards, but I'm not sure which!
For reference, the species is roughly human-sized and has an upright build and is a very distant descendant of a type of animal that had characteristics of both insects and other arthropods - namely the circulatory system and closed respiratory system of land crabs - but has diverted massively since, to the point that it no longer fits that classification (mostly so I can get away with it being human-sized without having to deal with factors that limit insect and arthropod size, like the weight of pure exoskeletons and the poor oxygen-carrying capacity of Haemocyanin).
I've gotten some very helpful feedback, and now all I'd like to clear up once and for all is whether Coboglobin is more suited to warm, oxygen-rich environments as this source states or cold, oxygen-poor environments as this source states.