DC -- Natl Gallery of Art -- West Wing -- Sculpture:
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NGAS_040421_236.JPG: The Lost-Wax Casting Process
The most common casting method used through the centuries for all kinds of bronze objects (sculpture, weapons, tools) has been the lost-wax process. This method allows the artist to produce accurately the delicate nuances of an original clay, plaster, or wax model. In this display, contemporary models illustrate the same eleven-step lost-wax casting process that the French master Auguste Rodin (1840-1917) used to make his bronze Sorrow (La Douleur), modeled in 1889 for his great project "The Gates of Hell". Designed as doors for a planned but never realized museum of decorative arts in Paris, the complete Gates project was cast in bronze only after Rodin's death.
Produced by B. Gerald Cantor by the Coubertis Foundry, Paris, in conjunction with the Musee Rodin, Paris, this display was given to the National Gallery of Art by the Iris and B. Gerald Cantor Collection.
1. The sculptor creates a model, which is generally made of clay, marble, stone, or wood. Sometimes, as in this display, a plaster cast from an original in one of these materials may serve as a model for casting in bronze.
2. An impression of the model is made in a bed of very fine, elastic material supported by a rigid outer mold. The supportive outer layer is designed to withstand the pressure of melted wax running through the mold.
3.This sharply defined mold is used to create a fireproof clay model, identical to the artist's original model.
4. The surface of the clay model is scraped in order to reduce it by the desired thickness of the final bronze.
5. The mold is placed around the clay model and closed; wax is then poured into the space between the model and the mold. This stage is crucial in producing a perfect reproduction of the initial sculpture. The result is a wax model that is finished by hand to ensure fidelity. The artist's signature, a cast number, and a foundry seal are also incorporated.
6. Wax conduits, called sprues and gates, are attached to the model. They act as channels through which the wax, when heated, will escape.
NGAS_040421_239.JPG: The Lost-Wax Process (Steps 7 through 11)
7. A finely granulated ceramic is gradually applied to the surface of the model and its conduits until the applied ceramic material becomes thick and coarse. The end result is called an investment mold (from the French investir, "to surround"). The mold is then dried and heated; melted wax now flows from the mold and leaves a space between the fire resistant clay model and the investment mold. Thus this technique is called the lost-wax method.
8. The investment mold is then heated to a high temperature and covered with a coating, which must be completely dry before bronze pouring begins.
9. When poured into the cavity of the mold, molten bronze fills the space left by the wax model. The mold is broken as the metal appears; the figure and its conduits are an exact reproduction of the wax figure.
10. The conduits are then cut away so that no trace of them can be seen. This procedure of hand-finishing the bronze to perfection is called chasing. Remains of the fireproof clay model left inside are now removed through an opening left in the bronze.
11. Upon completion of the chasing, metal oxides or other chemicals may be applied to the surface of the bronze. They create a thin layer of corrosion -- usually brown, green, or blue in color -- which is called the patina.
AAA "Gem": AAA considers this location to be a "must see" point of interest. To see pictures of other areas that AAA considers to be Gems, click here.
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Directly Related Pages: Other pages with content (DC -- Natl Gallery of Art -- Sculpture) directly related to this one:
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2021_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (9 photos from 2021)
2020_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (2 photos from 2020)
2018_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (28 photos from 2018)
2017_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (3 photos from 2017)
2016_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (8 photos from 2016)
2015_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (10 photos from 2015)
2014_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (5 photos from 2014)
2013_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (77 photos from 2013)
2012_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (18 photos from 2012)
2009_DC_NGAS: DC -- Natl Gallery of Art -- West Wing -- Sculpture (186 photos from 2009)
2004 photos: Equipment this year: I bought two Fujifilm S7000 digital cameras. While they produced excellent images, I found all of the retractable-lens Fuji models had a disturbing tendency to get dust inside the lens. Dark blurs would show up on the images and the camera had to be sent back to the shop in order to get it fixed. I returned one of the cameras when the blurs showed up in the first month. I found myself buying extended warranties on cameras.
Trips this year: (1) Margot and I went off to Scotland for a few days, my first time overseas. (2) I went to Hawaii on business (such a deal!) and extended it, spending a week in Hawaii and another in California. (3) I went to Tennessee to man a booth and extended it to go to my third Fan Fair country music festival.
Number of photos taken this year: 110,000.
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