A fine, granular substance with a slightly metallic sheen, resembling gunpowder but with a more volatile appearance. The powder particles are irregular in shape, ranging from tiny specks to small clumps, giving it a rough, textured surface. The color is a deep charcoal gray with occasional glints of silver or copper, suggesting the presence of metal compounds. Stored in a small, weathered glass vial with a cork stopper, the vial shows signs of frequent use, including scratches and soot marks around the opening.