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An oil pastel is a painting medium that consists of powdered pigment mixed with a binder mixture of non-drying oil and wax. Oil pastel is a type of pastel. They differ from other pastels which are made with a gum or methyl cellulose binder, and from wax crayons which are made without oil. The surface of an oil pastel painting is less powdery than one made from other pastels, but more difficult to protect with a fixative. The colors of oil pastels are bold[definition needed] and bright. They can be blended easily but they can break easily too.