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Integrally colored concrete uses natural or synthetically manufactured iron oxide pigments. Available in powder, liquid and granular form, the smaller iron oxide pigment particles cover the larger cement particles when added to any cement-based mix to create color that is uniform throughout the concrete. Iron oxide comes in four colors: black, red, brown, and yellow. The blending together of these basic colors produces a variety of other colors. Cobalt and chromium oxide are used for blue and green pigments. Integrally colored concrete will not fade over time, but will change due to efflorescence, pollution, dirt, and traffic. Typically, a good cleaning and sealing will bring back the original color.