The book represents a thorough study of MoO3 as an alternative to the well known member of chromogenic materials which have a photochromic phenomenon. Based on that, it has wide application in optoelectronic solar energy modulation and saving energy. These solar control coatings, however, pose a problem in varying climates such as in northern and central Europe. For these cases, materials that have altering properties owing to external surroundings could be the solution. These chromatic materials include several categories, such as photochromic glasses and polymers, thermochromic metal oxides...