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The Electrotyping Process

Tiffany and Company’s famous Bryant Vase was meticulously crafted by highly skilled artisans­­—among them, Augustus Saint-Gaudens and Eugene J. Soligny—who worked the silver for more than a year. Curator Ellenor Alcorn describes how Tiffany then used the fascinating nineteenth-century process of electrotyping to create presentation copies.

Ellenor Alcorn, associate curator, Department of European Sculpture and Decorative Arts, The Metropolitan Museum of Art


Learn more about the exhibition Victorian Electrotypes: Old Treasures, New Technology, on view at the Met November 22, 2011-April 22, 2012:
http://www.metmuseum.org/exhibitions/listings/2011/electrotypes

Learn more about the Museum’s American collections:
http://www.metmuseum.org/about-the-museum/museum-departments/curatorial-departments/the-american-wing


Credits

Produced by The Metropolitan Museum of Art, in conjunction with Dynamic Diagrams


Transcript

Ellenor Alcorn: The Bryant Vase was completed in 1876 by a team of skilled artists working for Tiffany and Company. They worked for more than a year, meticulously chasing the sterling silver. Tiffany made a second vase for presentation using the electrotyping process.

To make an electrotype, molds are taken of each section of the vase. A flexible molding material is applied to the surface —in this case, gutta-percha, the sap of an East-Indian tree.

The mold hardens, leaving a precise impression. A coating of graphite makes the interior of the mold electrically conductive. Wires are attached to the inner surface. The mold is suspended in a copper-sulfite bath with a piece of copper, and an electrical charge is applied.

The negatively charged graphite attracts the positively charged copper ions, eventually building up to form a thick copper wall. When the copper is thick enough, the mold is removed from the bath. The copper form is separated from the mold.

Additional copies can be made using this first example as a master pattern. The edges are trimmed and filed. The sections are soldered together. Then the copper is plated with silver, by immersing it in a bath of silver cyanide with a piece of silver. When the electrical charge is applied, a layer of silver is deposited on the surface.

In order to perfectly match the original, the copy is oxidized. On the surface, the two vases seem to be identical in every minute detail, though the copper vase was made in much less time.

Electrotyping had far-reaching uses, in the duplication of works of art, in manufacturing, and in the printing industry. This technology was one of many radical innovations made possible by the growth of electrical science.

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