Semtex

Semtex is a general purpose plastic explosive used in commercial blasting, demolition, and in certain military applications. In DC Comics continuity, the Riddler captured Arthur Brown and fitted him with a vest loaded with Semtex, which could be detonated by a remote trigger. Batman had to save Brown from exploding by racing all across Gotham City with him solving the Riddler's clues. In Marvel Comics continuity, the Black Widow planted a briefcase filled with Semtex inside the room of Chernayan ambassador Peter Antone. When Peter opened the briefcase, the bomb exploded, killing him.