Stinky Ink recently made an ink infographic illustrating the simplest facts we should know about ink history.
It can be found here.
And of course, it's not ink without our favourite form of ink: tattoos. Stinky Ink shows us where most of the hues on embedded in our skin come from, and a couple statistics about tattooed people as well. It's definitely an interesting five-minute read worth the procrastination you're probably doing as of now from work or whatever you're supposed to be doing.