the State Dining Room, and the Entrance Hall, refurnishing, repainting in decorative patterns, installing newly designed mantelpieces, changing to wallpaper with dense patterns, and, of course, adding Tiffany glass to gaslight fixtures and windows and adding an opalescent floor-to-ceiling glass screen in the Entrance Hall. The Tiffany screen and other Victorian additions were all removed in the Roosevelt renovations of 1902, which restored the White House interiors to Federal style in keeping with its architecture. A desire to concentrate on art in glass led to the breakup of the firm in 1885 when Tiffany chose to establish his own glassmaking firm that same year. The first Tiffany Glass Company was incorporated December 1, 1885, and in 1902 became known as the Tiffany Studios. In the beginning of his career, Tiffany used cheap jelly jars and bottles because they had the mineral impurities that finer glass lacked. When he was unable to convince fine glassmakers to leave the impurities in, he began making his own glass. Tiffany used opalescent glass in a variety of colors and textures to create a unique style of stained glass. Tiffany acquired Stanford Bray's patent (https://patents.google.com/patent/US349424A/en)for the "copper foil" technique, which, by edging each piece of cut glass in copper foil and soldering the whole together to create his windows and lamps, made possible a level of detail previously unknown. This can be contrasted with the method of painting in enamels or glass paint on colorless glass, and then setting the glass pieces in lead channels, that had been the dominant method of creating stained glass for hundreds of years in Europe. The First Presbyterian Church building of 1905 in Pittsburgh, Pennsylvania, is said to be unique in that it uses Tiffany windows that partially make use of painted glass. Use of the colored glass itself to create stained glass pictures was motivated by the ideals of the Arts and Crafts movement and its leader William Morris in England. Fellow artists and glassmakers Oliver Kimberly and Frank Duffner, founders of the Duffner and Kimberly Company and John La Farge were Tiffany's chief competitors in this new American style of stained glass. Tiffany, Duffner and Kimberly, along with La Farge, had learned their craft at the same glasshouses in Brooklyn in the late 1870s. In 1889 at the Paris Exposition, Tiffany was said to have been "overwhelmed" by the glass work of Émile Gallé, French Art Nouveau