The catalogue is dedicated to diverse aspects of the rediscovery of color in the glass art of the nineteenth and twentieth century. The influential color theories of Isaac Newton, Michel Eugène Chevreul, Owen Jones, or Johannes Itten, which created the theoretical basis, are addressed as well as methods for producing stained glass developed by artists such as Clement Heaton, Charles Wasem, or Marcel Poncet, and Islamic art, which served as a source of inspiration. The examination of color and the expansion of the existing color palette in glass art are then presented based on works created within the context of the opalescent era in American stained glass, the Bauhaus, and the revival of Swiss stained glass by the St-Luc group of artists.