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How did Louis Comfort Tiffany develop Favrile glass?

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The north rose window at Chartres Cathedral in France, featuring intricate stained glass with vibrant geometric and biblical designs in a large circular and five tall vertical panels. — stained glass The stained-glass rose window in the north transept of Chartres Cathedral, France.

Louis Comfort Tiffany developed Favrile glass through extensive experimentation with unique coloring and glassmaking techniques that began in 1875. While Tiffany is credited with the invention, the technical development was driven by his collaborator, Arthur J. Nash.12

The primary goal was to artificially recreate the natural, iridescent sheen found on ancient buried glassware, such as pieces unearthed near Roman ruins. To achieve this, metallic lustre pigments were applied to the glass. Unlike European lustred glass of the time, which typically used transparent glass to achieve a mirrorlike finish, Tiffany employed opaque glass to produce a soft, pearl-like, satiny sheen.2

The process involved several sophisticated methods:
* Layering: By sandwiching transparent cobalt-blue glass between layers of transparent yellow glass, a deep, iridescent blue effect was created.2
* Texturing: Surfaces were textured by rolling hot glass over crushed, multicolored glass or by inducing and breaking bubbles on the surface.2
* Decoration: Opaque bodies were decorated with threads or patches of various glass types to create contrasting effects of brilliance and subdued sheen when coated with metallic compounds.2