From life-like faces to elaborate nature scenes, tattoos are a true art form. Although people have decorated their bodies for millennia for ceremonial and religious reasons, many people today adorn themselves with these images as a form of self-expression. But the inks used for tattoos are unregulated in the U.S., resulting in products whose components are largely a mystery. Now, researchers have analyzed almost 100 inks and report that even when these products include an ingredient label, the lists often aren't accurate. The team also detected small particles that could be harmful to cells.
The researchers will present their results today at the fall meeting of the American Chemical Society .laser light
is used to remove tattoos," says John Swierk, Ph.D., the project's principal investigator."But then I realized that very little is actually known about the composition of tattoo inks, so we started analyzing popular brands." Swierk and undergraduates in his laboratory interviewed tattoo artists to see what they knew about the inks they use on their customers. The artists could quickly identify a brand they preferred, but they didn't know much about its contents."Surprisingly, no dye shop makes pigment specific for tattoo ink," Swierk explains."Big companies manufacture pigments for everything, such as paint and textiles. These same pigments are used in tattoo inks.
"Every time we looked at one of the inks, we found something that gave me pause," Swierk says."For example, 23 of 56 different inks analyzed to date suggest an azo-containing dye is present." Although many azo pigments do not cause
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