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Pastel Dry A powdered pigment, mixed with a binding material (glue, gum arabic, plaster of Paris), rolled into sticks, and dried. The synthetics are more consistent in quality than natural chalks, and come in an almost limitless range and variety of colour and degree of softness. There is no real distinction between synthetic chalks and pastels, though the latter term is used to designate the brilliantly coloured, soft, dry sticks used in the eighteenth and nineteenth centuries.
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