I didn't realize that tattoo ink contained animal products. Ew. (I'm a vegetarian so I would definitely go for the vegan ink!)
That's the first I've heard of that.... but I'm not into tattoos anyway.
Tamera: here's a blog post outlining what isn't vegan about standard ink: http://bradstevenstattoo.wordpress.com/2013/03/27/the-real-deal-with-vegan-tattoos/