The largest use of iron oxide pigments in architecture, its covering power, tinting strength, good light resistance, alkali resistance, heat resistance are good, and very cheap and widely used. In a variety of precast concrete and building products materials as coatings or colorings, there are directly transferred to the application of white water mud, such as the wall plaster, artificial marble, terrazzo Ping and silicate products such as coloring; and a variety of interior and exterior color concrete surface, such as the airport runway, streets, color tile etc..