These glow in the dark pigment powder will add to any of our mica powder to provide a glow when the lights go out. They also glow, and charge, under black light. Jars contain 20g by weight like our mica powder although because the glow powder is so dense it looks short. A little goes a long way though. Note. Some of the powder may clump in the jar and may need a little separating with a stirrer. We source our mica from ethical sources so as not to support child labour mining that happens with some mica powder sources. All our mica are also eco and bio friendly.