Chalk is a soft, white, porous type of limestone mainly composed of calcium carbonate. Natural chalk consists of the amorphous remains of shells of microscopic marine organisms deposited on the sea bottom.
Chalk in art and writing
In drawing, chalk is combined with dark drawing media such as charcoal to create highlights and special effects. Usually a non-white paper of a medium value is used for this purpose. See chalk and charcoal for more on this technique.
Chalk is also used for many other purposes, for example in sports and climbing for a secure grip.
Chalk and spanking
See the chalk dust method.
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