The tattoo is made from a gel that includes a chemical receptor that changes color when it comes into contact with a common ...

Researchers have created their own temporary tattoo sticker that has a hidden purpose: detecting the presence of one drug used to “spike” alcoholic beverages.

U.S. President Donald Trump held up a photo supposedly showing that Kilmar Abrego Garcia's hand tattoos meant he was a member of the MS-13 gang.

Pause the tape. Rewind it to about a week earlier, when Mr. Trump in a social post held up a photograph of the man, Kilmar Abrego Garcia, showing him with four tattoos, one on each finger.