Black powder is a type of gunpowder composed of charcoal, sulfur, and saltpeter. It is also known as gunpowder and was first invented in China in the 9th century. The term 'black powder' is derived from the fact that it is a dark gray or black powder. The crossword solutions for the term 'black powder' are KOHL (4 letters) and SOOT (4 letters). KOHL is a type of eye makeup made from a powder, usually containing antimony, and SOOT is a black or dark gray powdery substance produced by the incomplete combustion of organic matter.