Powder A

Powder A, also known as black powder, is an explosive composed of saltpeter (potassium nitrate), sulfur, and charcoal. It is a deflagrating explosive, meaning it burns rapidly, producing lower pressures compared to high explosives like TNT or dynamite.12

Black powder is believed to have originated in China around the 10th century, initially used for fireworks and signals, with possible early military applications. By the 14th century, its use in firearms was documented across various countries. For centuries, its composition remained consistent: approximately 75% saltpeter, 15% charcoal, and 10% sulfur.1

While initially manufactured by hand, the process evolved to include water-powered mills and, in the 1800s, metallic crushing devices. Modern production involves ball mills for pulverizing ingredients, followed by grinding and mixing with water. The mixture is then pressed into cakes, broken into grains, and glazed with graphite for improved flow and moisture resistance.3

Black powder was later used for peaceful purposes in mining and civil engineering starting in the 17th century. A variation, B blasting powder, used sodium nitrate and was less expensive, though less potent than A powder, which remained preferred for firearms and military devices.1