The Chamber Hive-Mind strikes again! His blood is probably sludgy too.
Like black strap molasses. It’s not like it’s moving around in his veins or anything. I’ve considered drawing him with a certain lividity in, like, his hands. There’s all kinds of weird things you could do if you take the walking corpse aspect to its sorta natural conclusion. I usually make him a sorta grey-beige, mood depending.