Adamantium grey, like the metal fused to his bones.
Wolverine is a light grey.
It can be described as light, pale, neutral and almost grey.
Set in black, because black reads best on it.
The wolverine, also called the carcajou or quickhatch, is the largest land-dwelling member of the family Mustelidae. It is a muscular carnivore and a solitary animal. The wolverine has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times larger than itself.
Read on WikipediaWolverine is a superhero appearing in American comic books published by Marvel Comics. The character first appeared in the comic book The Incredible Hulk #180 (1974) and is best known as a member of the superhero team, the X-Men. Wolverine is the alias of James "Logan" Howlett, a mutant born in Canada in the late 19th century. He possesses a range of superpowers including highly advanced self-healing abilities, a significantly prolonged lifespan, animal-keen senses, and retractable claws. His skeleton is reinforced with the unbreakable fictional metal adamantium, which he acquired after becoming an unwilling test subject in the Weapon X super soldier program. Wolverine is commonly depicted as a gruff loner susceptible to animalistic "berserker rages" who struggles to reconcile his humanity with his wild nature.
Read on WikipediaNoun