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canvas prints black canvas prints carbon canvas prints chemical canvas prints chemistry canvas prints element canvas prints gunpowder canvas prints historical canvas prints history canvas prints lab canvas prints laboratory canvas prints military canvas prints potassium nitrate canvas prints saltpetre canvas prints sulphur canvas prints three canvas prints

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Gunpowder components. Sulphur (yellow), carbon (black) and saltpetre (potassium nitrate, white) in the correct proportions to make gunpowder. Saltpetre-based explosives date back thousands of years to ancient China. Modern gunpowder, in the proportions shown here, is first recorded from the 17th century. The proportions commonly used are saltpetre:carbon:sulphur (15:3:2).

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