Definitions for "Black powder"
A primitive form of explosive
(n.) The original formula for gunpowder. It is now called "black powder" to distinguish it from smokeless powder. It is a simple mechanical mixture consisting of 75% potassium nitrate (KNO3; AKA saltpeter), 15% sulfur (S), and 10% charcoal. It is much less powerful than smokeless powders, produces more fouling, and produces a large amount of smoke when ignited. It is considered obsolete for use in military firearms, but is still used widely in sporting guns and in blasting. It is designated as a Class A "low explosive." In contrast, smokeless powder is not an explosive, but a "flammable substance." Black powder can be ignited by a spark, static electricity, or concussion.
Traditionally, a mixture of charcoal, sulphur and saltpetre used as a propellant. Still used by enthusiasts today both in muzzle loading and cartridge firearms. Most notable characteristic is large amounts of smoke when fired.