Raw kaolin from the quarry is first added to water to create a suspension (gunge). This suspension undergoes a number of treatments whereby various components are separated from one another through rinsing, and contaminants such as quartz and mica are removed from the kaolin (de-gritting). This results in a pure product, which is also called China clay or pipe clay.

Kaolin is the binder of Rembrandt Soft Pastel, Rembrandt Carré Pastel and Van Gogh Pastel.

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