Can someone tell me what sort of ink is used in this tattoo?

So I just heard about this amazing game coming out sometimes next year called “From Dust.” Long story short, it’s a god-genre game where you’re put in charge of the fate of some islanders.

I’ve been interested for a while in more primitive cultures, and would like to incorporate some aspects of them into my life. Can anyone tell me the real-life ink or dye that would be used to make similar designs to the one’s featured in this picture?

http://media.rundlc.com/galleries/53/FromDust3D2.jpg

I tried googling tribal tattoos to see if I could track down some old cultures with similar designs, but all I found was designs for contemporary “tribal” tattoos. I want the authentic stuff here! :)