the.com/nitre

Saltpeter by another name: the oxidizer that turns charcoal and sulfur into a bang.

means An old name for saltpeter (potassium nitrate), the crystalline salt that supplies oxygen to make gunpowder explode and once was scraped from cellar walls to cure meat and make fertilizer.

from From Latin 'nitrum,' via Greek 'nitron,' tracing back to an ancient word (possibly of Egyptian origin, linked to natron, the mineral salt used in mummification) that originally covered a broader family of mineral salts, not just saltpeter specifically — the meaning narrowed over centuries as chemistry got more precise about what was actually fizzing in the jar.

chemical id
potassium nitrate, KNO3
gunpowder role
supplies the oxygen fire craves
old use
preserved meat before refrigeration existed
biblical mention
vinegar on nitre fizzes, per Proverbs
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