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.