GPT on Question 21, Sep 14

In the 18th century, black powder was usually produced in specialized, water-powered powder mills rather than by individual soldiers or gunsmiths. The basic ingredients were purified saltpeter (potassium nitrate), charcoal, and sulfur.

A typical historical process was:

• 1.Refining materials: Saltpeter was purified by dissolving and recrystallizing it. Sulfur was refined, while charcoal was made from selected woods—often willow, alder, or dogwood—under limited air.
• 2.Pulverizing: The ingredients were ground, generally separately at first, to reduce accidental ignition.
• 3.Incorporation: They were combined while damp in heavy edge-runner mills. Water reduced airborne dust and helped produce a uniform mixture.
• 4.Pressing: The damp powder was compressed into dense cakes.
• 5.Corning: The cakes were broken into grains. This was a major improvement over earlier loose “serpentine” powder because granular powder burned more consistently and resisted separation during transport.
• 6.Grading and glazing: Sieves sorted grains by size for muskets, cannon, pistols, or priming powder. Tumbling rounded and polished the grains; graphite glazing became more common later.
• 7.Drying and proofing: Powder was carefully dried, then tested for strength and consistency before being packed in wooden barrels.

Powder mills used widely separated buildings, lightweight roofs, non-sparking tools, and barriers because explosions were frequent occupational hazards. Exact formulations and grain sizes varied by country, manufacturer, and intended use. Attempting to reproduce these processes is extremely dangerous and may be illegal.