[問題] 古代硝石取得方法
小弟看人家寫道,還沒有用海水製硝來大量生產硝時。
英國還有專門從糞便中取得硝石的方法,
那我想問一下,當時的硝石主要來源都是礦產
還有糞便嗎??
有其他的方法可以取得嗎??
各國是如何取得火藥來源的??
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