I am currently working in a "fantasy" world without any kind of magic and I thought of a race with different skeleton color (blackish in particular but I want to know in general). I am not well versed in biology but may I guess the white in our bones is from the calcium phosphate that forms them?
So, is there any other component that could realisticly (to a certain extent) form an skeleton of different color? In particular black/grey. Maybe there is a way of getting pigmented bones by adding other component to the mix?
Hope I made myself clear as I could not find any information related to this topic in these forums nor other. I would love to keep my world as realistic as possible.
Thanks in advance for your answers!