... alkaline oxides react with the acid-generating iron salts, slightly soluble in acid, in concentrated hydrochloric acid can be completely dissolved, ... , terrazzo, mosaic tiles, artificial marble. 2, Iron oxide red pigments for coloring a variety of coatings and the ... furniture paint, electrophoresis paint and enamel. 3, Iron oxide red pigments for coloring plastics, such as thermosetting plastics ...