C4

A giant doll, shaped like Deidara himself. When it ruptures, a cloud of microscopic bombs are released. Impossible to be seen by a normal person, the victim(s) breathe in the bombs, which then enter the bloodstream. Once there, the countless micro-bombs explode, causing the victims' bodies to disintegrate at the cellular level, literally turning them into dust. According to Deidara, he created C4 for the sole purpose to defeat Itachi, to combat his Sharingan and the genjutsu it could create.

This jutsu is named C4 Karura, so it may be possible that there are other varieties of C4, but it was never discovered. In creating this jutsu he eats the clay with his own mouth as opposed to the ones on his hands.