The range of Art Nouveau glass created by the American Louis Comfort Tiffany (1848–1933). The son of a jeweller, Tiffany trained as a painter and then turned to the applied arts and interior decoration. He became interested in glass and in 1892 he opened Tiffany Furnaces to produce his designs. In 1894 he patented his iridescent, hand-made glass, called *‘favrile’, from the Old English word ‘fabrile’, meaning hand-made. Shapes were elegant and organic, decorated in flowing patterns within the glass to suggest foliage, flowers, or peacock feathers, in iridescent gold, green, or mauve. The glass during firing was treated with metal oxides and exposed to acid fumes, to create the unique range of colours. Tiffany also designed lamps with shades made of a mosaic of ‘favrile’ glass, stained glass, and metalwork. His designs were popular in America and Europe, where he frequently exhibited, especially in Siegfried Bing's gallery in Paris, L'Art Nouveau.
http://www.metmuseum.org/toah/hd/tiff/hd_tiff.htm Description and illustrations on Metropolitan Museum of Art website.