Which item do I need to dismantle to get saltpeter?

[ZIGS]

I need saltpeter but I don't wanna buy it. I know there's probably an item I can dismantle and get saltpeter from, anyone knows which one is it?

[Ͽ҈҉Ͼ]

Nothing available early on. It starts appearing as random loot once you move to the second area, so you'll be able to make grapeshot soon after entering the second area unless you buy it from the alchemist in White Orchard.

Given how alchemy items refresh when you meditate as long as you have alcohol, you're usually best just buying the components in exchange for all that dog tallow you tend to collect. Make it once, use it when needed, meditate to resupply.