Lycopodium powder

Common card · No. 466138

Lycopodium powder, also known as vegetable sulphur and formerly witchmeal, is a yellow-tan, dustlike powder consisting of the dry spores of clubmoss plants or various fern relatives. When it is mixed with air, the spores are highly flammable and are used to create dust explosions as theatrical special effects. The powder was traditionally used in physics experiments to demonstrate phenomena such as Brownian motion.

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