Loetz patented the Phänomen technique in 1898, but by that time the firm was also incorporating techniques pioneered by L.C. Tiffany in the United States—in particular, Tiffany’s iridescent Favrile work. Combined, the two techniques provided plenty of inspiration for Loetz designers and artisans, including E. Prochaska, Franz Hofstötter, and Koloman Moser.

The Kralik glassworks was another well-known maker of antique Bohemian art glass, although it would not rise to prominence until the Art Deco period. During the Art Nouveau, it was largely producing vases, jars, and shells in the style of Loetz and others. Today, collectors of antique Bohemian art glass are often buying a Kralik when they are being sold a Loetz.

Rindskopf and Sons was another contemporary of Loetz. Although early 20th-century glass enthusiasts had no difficulty differentiating its tall vases, with their slender bodies and bulbous heads, from Loetz pieces, today sellers routinely label Rindskopf pieces incorrectly as Loetz. Series to look for include Pepita, Grenada, and Alhambra.

Ludwig Moser & Sons of Karlsbad, in what is now Austria, excelled at cut, gilded, and acid-etched pieces. And then there was Pallme-König and Habel, which had its own patent for threading glass onto a vase. In Pallme-König’s case, the threading ranges from tight and regular lines to treatments that are almost Jackson Pollock-like, in which the thick threads of glass appear to be the only things that are keeping the deformed shapes underlying them from collapsing and falling apart.

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