Quicklime

Modeled after the Quicklime Congealing Technique, Quicklime weapons are hollowed out tools filled with a modified Calcium Oxide powder. Upon impact, the weapons shatter, releasing the powder. On its own, this Quicklime can cause minor burns and irritation, or even temporary blindness. The true usefulness of the specialized Calcium Oxide comes from its reaction to water, though. Almost instantly after contact with liquid, the powder will harden and expand, forming a substance harder than stone. Outwardly, the tools are identical to their typical counterparts, making them indistinguishable to the naked eye, and even most Dōjutsu. Quicklime weapons are most commonly made in three varieties: Kunai - Throwing knives. While these can also be used in hand-to-hand combat, most users don't want to risk the powder afflicting them as well. Shuriken - Throwing stars. These can be used identically to traditional Shuriken. Bombs - Small pellets that can be thrown by the handful to increase the amount of Quicklime power used on a single target.

Trivia
While these weapons and tools will unleash their payload upon contract, they can also be channeled with the users chakra to force detonation at any time.