Image: GNM3227a 6r
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Description: fol. 6v of MS GMN 3227a. Recipes for making gunpowder (pulveres pixidum).
for a common (communis) powder, use two parts nitrate, (sal nitri seu petrosi) and one part each of sulfur and lindenwood coal (2:1:1). for a stronger (vehemens vel velox) powder, use the ratio 4:1:1. the third recipe increases the proportion of sulfur, to a ratio 9:5:2 (4.5:2.5:1).
The optimal ratio (according to modern literature) would be 6.4:1.2:1.
T. Ehlert, R. Leng, "Frühe Koch- und Pulverrezepte" in: Medizin in Geschichte, Philologie und Ethnologie: Festschrift für Gundolf Keil, 2003, p. 308.
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