Medium and Hard Pastels have less pigment, and more binder. They are firmer to work with, but the colors are not as vivid. They are good for making crisp lines and details as they can be sharpened to a point. They are often used for outlining or adding intricate details to work done in other media. Because hard pastels are less vivid, some pastel artists use them for background color. Hard pastels are recommended for preliminary sketching.