Saltpetre in medieval gunpowder: Calcium or Potassium Nitrate? – Medievalists.net

Just one of the interesting things I get to research for my Black Powder Wars fantasy series.

Until recently, it has been accepted that the formulation of gunpowder has always been based on variable mixtures of charcoal, sulphur and potassium nitrate. This has recently been challenged: Saltpetre in medieval gunpowder: Calcium or Potassium Nitrate? – Medievalists.net

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