There are thousands of chemicals, mostly dyes, used to create tattoos. Some of them are known carcinogens. Although the tattoo-cancer link is weak, people who are worried can get them removed. But the lasers that remove tattoos react with some inks and produce a different set of carcinogens—a strange but interesting problem.
Tattoos are a popular trend among young people and adults alike. According to the Harris Poll, their prevalence has increased over the past decade, climbing from about 15% five years ago to 21% in 2012. When comparing