This book focuses on the relation between the color and the structure of materials in the case of transition metal ions. This second edition reflects the growing interest in color problems observed in various areas of science and technology. The text includes new chapters addressing experimental studies and ligand-field based predictions on the color of 3D metal compounds and the use of metals and metal compounds as colored nanoobjects. It also features the use of computer-derived data. In addition, the authors expand information on color in inorganic chemistry as well as the color of lanthanide and actinide ions and compounds.