How did Louis Comfort Tiffany create his Art Nouveau stained glass?

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Louis Comfort Tiffany created his Art Nouveau stained glass by mixing different colors of glass together while hot. A technique known as "favrile" was used, in which different shades of glass were layered and heated until they fused together, creating a unique effect of color and texture. This technique allowed Tiffany to create a wide range of colors and patterns in his stained glass designs.

How Did Louis Comfort Tiffany Create His Art Nouveau Stained