Tattoo ink can seep deep into body

— Microscopic particles from tattoo ink can migrate into the body and wind up in lymph nodes, crucial hubs of the human immune system, a study revealed Tuesday.

The tiny particles — measuring a few millionths to a few billionths of a centimeter — include molecules from preservatives and contaminants such as nickel, chromium, manganese and cobalt, researchers reported in the peer-reviewed journal Scientific Reports.