John Swierk is an assistant professor of chemistry at Binghamton University, State University of New York. Tattoos are an incredibly common form of permanent self-expression that date back thousands ...

The hashtag #tattootok has over 2.6 billion views on TikTok. Individual tattoo artists have built huge followings by sharing insights into their work. Some highlight their designs while others have ...

Ink is sometimes made from products that were not manufactured for tattoos. Researchers are raising concerns about the quality of tattoo ink, saying the ink isn't always properly labeled and, in some ...