A couple of surprising things from the above article:
"Tattoos are incredibly popular worldwide with more than a third of 18-25 year olds in the US sporting at least one design," said Mr Eames.That's a bigger proportion than I would have expected. Then there's this:
Tattoo inks are a suspension of water-insoluble particles, such as mercury, lead, cadmium and iron, which are injected under the skin using a needle.
Over time, these inks become dispersed as the cells which contain them die, divide or leave the body.
My, that sounds like a healthy past time: injecting your cells with poisonous metals. Are there ever any health consequences of that?
What a pity. It would cause me some amusement if it turned out the FDA wanted to restrict tattooing somehow.