There's iridium-based blood called Chloro-carbonyl-bis(triphenylphosphine)-iridium that's effective at transporting hydrogen alongside oxygen.
What I want to know is that, are there other metal-based blood types that can be used/be effective at transporting other non-oxygen-based gases? Such as a metal-based blood type that's effective at transporting methane for example.
And what color would the blood be when they're saturated with these non-oxygen-based gases?
To clarify, the gases I want to know that can be transported effectively by certain blood types are:
Methane. Chlorine. Sulfur. Ammonia. Noble gases.
In terms of what metal-based blood types, I'm not sure, there isn't much information on how none oxygen-based gases can be transported by blood types I can find, and it's why I'm asking.