/ chawk /

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How Chalk is made:

Source: Chalk is a rock derived from marine ooze and largely composed of fossil remains of unicellular algae. Mineral: calcite
Natural variety of pigment crude chalk is left to weather, then ground and washed.

The ground pigment:

Pile of ground Chalk

Other whites
(intro) - Calcium carbonate whites - Lead white - Titanium white - Zinc white