post #17794 post #65071 post #63051 post #1490933

A susbtance and an object formed by the compressed substance used to write on a chalkboard. Typically white and consisting of calcium sulphate or calcium carbonate, but also available on other colours. Can also be used to draw temporary street art.

Also the substance applied on the tip of a billiard queue or on athlete's hands to increase friction and remove moisture.