Same shirt, closer. A black t-shirt with the periodic table printed on it. The elements have been colour coded to answer the question “Can I lick it?” The legend is: Green = No problem, Yellow = Problem, Red = Yeah, No, Dark grey = Ya dead. Basically you don’t want to mess with most of the alkali metals and all of the halogens. Also mostly anything above polonium looks like a bad idea.

A black t-shirt with the periodic table printed on it. The elements have been colour coded to answer the question “Can I lick it?” The legend is: Green = No problem, Yellow = Problem, Red = Yeah, No, Dark grey = Ya dead.