Hard pastels are best used on paper. The variations in the effects depend on the way the pastel is held, the degree of pressure exerted, the grain and colour of the paper. All these will make a line that is more or less saturated. Pébéo breadcrumb gum in mouldable paste form is used to clear the pastel by absorbing the pigments that are excessively deposited on the sheets. The Pébéo pastel and charcoal fixative can be used to fix the powdery pastel colour without changing the hue.