material
Black chalk
A natural carbonaceous or prepared black drawing chalk, softer and warmer than pure graphite sticks. Not graphite as the mineral alone, and not charcoal as stick charcoal.
Also known as Black chalk stick · Natural black chalk
material
A natural carbonaceous or prepared black drawing chalk, softer and warmer than pure graphite sticks. Not graphite as the mineral alone, and not charcoal as stick charcoal.
Also known as Black chalk stick · Natural black chalk