Is stump remover pure enough source of KNO3 for black powder?
” Yes, most stump remover is in the 98%+ purity range, which is plenty pure for black powder. Though I am told Grant’s stump remover is slightly impure. “How can I purify KNO3?” KNO3 can be dissolved into hot or cold water and then filtered to remove any insoluble matter. As long as most of the impurities are insoluble, you will be left with 99.x% KNO3. • Regarding things stated about BP manufacture: “You said that BP made via hand grinding is performing weakly but I obtained a fast powder this way!” I said that the force of the end product remains weak under all practically defensible circumstances. If you use a good charcoal and grind a small amount like hell you may get rewarded with a bite of fast powder. I hope you do not plan making shells or similar things, otherwise it ends like this: “Come on mum, please grind on. It´s just a pound.
