Gunpowder

Gunpowder, required to fire Engineer and Gunpowder firearms, is sold in small kegs or in horns stopped with wax to prevent moisture from ruining the powder. Each dose of gunpowder is good for one shot. Gunpowder quality varies greatly.

In any event, regardless of craftsmanship, gunpowder will not fire if wet. It must be dried before it can be used.

Souce
[[Category:G]]
 * Warhammer Fantasy RPG 2nd ED -- Old World Armoury
 * pg. 44