The gunpowder used is typically black powder or black powder substitutes like Pyrodex. Sometimes two types of gunpowder (and two flasks) were used consisting of finer priming powder for the flash pan and coarser powder for the main charge behind the ball. This was particularly the case with earlier muzzleloaders like matchlocks but appear to have been less common with flintlocks and was irrelevant with percussion locks since they used percussion caps rather than priming powder.