I have a race of people who have silver blood. Thing is, I'm really trying to keep it as realistic as possible despite this being a fantasy world. The blood has raw magic energy in it as well, but doesn't mix so were you to collect blood, there would be a silver/bright red (the color of raw magic here).
So far, and this is all working and will change with more information. Some things I know so far that may or may not be affected by the compound/color upon oxidation choice: when they blush they do get pink-red tinge because of the raw energy. If one of these people, for some reason doesn't have the energy in the blood, they pale instead. I have never specified if the blood changes color when they bleed or between artery/vein blood, but perhaps upon hitting open air it might turn black. Bruises are a ruddy gray to a charcoal black.
My only caveat is that they have to remain looking enough like "humans'-- the skin color is a narrow range of different levels of caucasian (ranging from kind of pale to kind of olive-y tan depending on activity level. They usually remain very light). They are also of a different blood than other races there as they are a sort of "invasive" species in that they were created long after the other races were a thing. Those with raw energy in the blood will be "pinker" than those who do not-- If there is none, they will be very, VERY pale.
Any help would be so appreciated. I've tried looking for ages, to no avail! I want to make this work! My best guess right -now- is that perhaps the blood is colorless, and it's the -plasma- that's silver?