December 9, 2017–June 10, 2018
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Dates
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Location
Arthur M. Sackler Gallery | Gallery 26c, 26e
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Collection Area
Chinese Art
Secrets of the Lacquer Buddha unites the only sixth- and seventh-century, life-size Chinese lacquer buddha sculptures known: one from the Walters Art Museum, one from the Metropolitan Museum of Art, and one from the Freer Gallery of Art. They have never been exhibited together before.
The exhibition explores how the sculptures were made, giving new insights into these deceptively simple objects. It also highlights how science can contribute to understanding art. The National Museum of Asian Art Department of Conservation and Scientific Research’s experts used specialized equipment and new methods to analyze the sculptures, exposing microscopic details. Find out what tree species the lacquer came from, what type of burnt bone was mixed in, and other unexpected discoveries.
Practice and Production: Four Life-Size Chinese Buddhist Sculptures
Introduction
By Donna Strahan and Denise Patry Leidy
The National Museum of Asian Art has united for the first time the most important early Chinese lacquer buddha sculptures known to exist. In this online publication, we explore these sculptures in tandem with the exhibition Secrets of the Lacquer Buddha, on view from December 9, 2017, through June 10, 2018. Working from both art historical and scientific perspectives, Secrets of the Lacquer Buddha has given us an opportunity to determine how and of what these unique images were made. Together, they offer a holistic view of early Buddhist lacquer sculptures, demonstrating the complexity and sophistication of these works.
Unlike those crafted in stone, metal, or clay, Chinese Buddhist sculptures in lacquer are extremely rare. The three earliest-known examples, dating from the late sixth to the early seventh century, are all life-size and all in the United States. One is in the collection of the Walters Art Museum in Baltimore; a second is in the Freer Gallery of Art in Washington, DC; and the third is in the Metropolitan Museum of Art in New York. The Walters buddha is the earliest preserved example of a sculpture made using the wood-core lacquer technique. The Freer and Metropolitan buddhas are the earliest extant sculptures produced with the hollow-core lacquer technique.
In addition to these three late sixth- and seventh-century sculptures, we were able to study an eighth-century bodhisattva head from a private collection. This allowed us to compare the lacquer sculpture technique across three centuries. Together, the four sculptures also offer insights into the relationship between the use of lacquer as a sculptural medium and religious practice during this formative period in East Asian Buddhism.
Scientific Analysis
The sculptures in Secrets of the Lacquer Buddha are more than fifteen hundred years old. NMAA researchers used multiple analytical techniques—involving both specialized equipment and the unaided eye—to determine how and with what the sculptures were made. Learn about these techniques in this image gallery.
The sculptures had been restored a number of times before they arrived at the NMAA. Much of our research was devoted to distinguishing which elements were original and which were later additions. Occasionally, we took minute samples of the objects to help identify their materials.
Scientific analysis alone cannot answer all of our questions. The results of a test must be carefully considered with other information before reaching conclusions. The most potent tools remain the human eye and an informed mind.
—Donna Strahan, head of conservation and scientific research, National Museum of Asian Art

Light microscopy methods allowed us to study minute samples removed from the sculptures. Using known materials for comparison, we could identify unknown substances.
Reflected and transmitted light magnified features of the materials as much as one hundred times. More specialized microscopy techniques that use polarized and ultraviolet light enabled us to identify textile fibers, lacquer layers, lacquer inclusions, and pigments. For example, we now know that the textile is hemp.
Here, a scientist identifies textile fibers under the polarized light microscope.
Image by Donna Strahan, National Museum of Asian Art
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Looking below the surface reveals the sculptures’ complexity. Resembling a chocolate layer cake, this is a magnified cross section of the layers of lacquer and textile in the Walters Buddha, magnified hundreds of times. Each layer is identified, from the textile at bottom to the paint at top.
Image by Blythe McCarthy, National Museum of Asian Art and Molly McGath, Heritage Science for Conservation, JHU
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Stains helped us identify materials in the samples when viewed under visible and ultraviolet light. Filters block most of the light, limiting it to wavelengths that cause certain materials to fluoresce.
Left: Freer buddha cross section, unstained. Right: Freer buddha cross section, stained for starch, which darkened those fibers
Images by Blythe McCarthy, National Museum of Asian Art
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Scanning electron microscopy provides magnification far beyond that attainable with a light microscope. When we equipped the microscope with energy dispersive X-ray spectroscopy, we could identify individual elements.
The image on the left is a cross section of the Metropolitan buddha, revealing textile and lacquer layers. Crushed bone particles (in white) are present throughout the lacquer layers.
On the right, one bone particle has been magnified 930 times. Blood vessel holes penetrate throughout the particle.
Images by Federico Carò, Scientific Research Department, Metropolitan Museum of Art
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X-radiography and computed tomography (CT) scans revealed the layers that make up the sculptures, helping us study their construction, joining methods, repairs, and other internal features. The objects were X-rayed while a device scanned them to produce many X-ray sections or slices. A computer then assembled the information into an X-ray reconstruction of the object’s interior. The X-radiographs confirmed that the top of the head on three sculptures was attached separately, providing access to install the eyes from the inside.
In this image, the Freer buddha enters the instrument for CT scanning at the National Museum of Natural History.
Image by Hutomo Wicaksono, NMAA
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X-ray fluorescence analysis is based on the principle that individual atoms, when excited by an external energy source, emit X-ray photons of a characteristic energy or wavelength. By counting the number of photons of each energy emitted from a sample, we could identify the elements present, such as calcium, lead, or copper.
Here, a scientist and conservator perform X-ray fluorescence analysis to determine the elements in the sculpture’s eye.
Image by Emily Jacobson, National Museum of Asian Art
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Pyrolysis gas chromatography mass spectroscopy (py-GCMS) helped us identify the organic components mixed in each lacquer layer, such as oils and starches. A minute sample was heated until it decomposed, producing smaller molecules that could then be separated and detected. We discovered blood was mixed in with some of the lacquer, and we determined which tree species the lacquer came from.
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Proteomics, a field of molecular biology that studies proteins in organisms, allowed us to identify the species of the ground bone mixed into the lacquer. The bone’s proteins were broken up into their component peptides. Then, we compared the peptides’ molecular weight—together with the sequences of amino acids that they contain—to databases of known protein sequences. We now know that the bone in one of the sculptures is equine, meaning it came from a horse, and another is bovine, or from a cow.
In this image, a conservator samples the bodhisattva for protein analysis.
Images by Blythe McCarthy, National Museum of Asian Art
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A Look Inside
Dive down into highly magnified images of the materials that make up the buddhas and the bodhisattva head. Click any image to look closer.

Bodhisattva head
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Right eye of the bodhisattva
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Close-up of the eye’s pupil
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The magnified pupil reveals glass flow and bubbles, which help identify it as glass rather than stone.
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Different types of microscopy reveal different elements. This one shows the bodhisattva’s lacquer layers in visible light.
Images by Blythe McCarthy, National Museum of Asian Art
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Microscopy often makes things more visible. This cross section of the bodhisattva under ultraviolet light identifies its lacquer layers.
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Backscattered electron imaging lets us see different chemical elements, as in this cross section of the bodhisattva.
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Bone is made of calcium and phosphorus. This X-ray map shows calcium in the bodhisattva.
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Bone is made of calcium and phosphorus. This X-ray map shows phosphorous in the bodhisattva.
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Looking into the hollow interior of the Freer buddha from the bottom
Images by Donna Strahan, National Museum of Asian Art
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Looking up into the hollow head area inside the Freer buddha
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Closeup views let us see features of the textile. This one shows the weave of the textile strips inside the Freer buddha.
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Textile and lacquer layers along the bodhisattva’s edge
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Close-up of textile weave on the bodhisattva. It is a plain weave textile.
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A fiber from the textile was examined under the polarized light microscope. Its shape and bright colors under specific lighting conditions identify the textile as hemp.
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Freer buddha
Images by Donna Strahan, National Museum of Asian Art
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Close-up of paint layers on the robe from multiple restorations over the centuries
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Cross sections reveal the order in which the pigments were painted. This one shows multiple pigment layers in between white ground layers on top of the brown lacquer.
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Support
Secrets of the Lacquer Buddha is sponsored by the Blakemore Foundation and Capital One.
Buddha; China, Tang dynasty (618–907), early 7th century; hollow-core lacquer with pigment and gilding; Purchase—Charles Lang Freer Endowment; Freer Gallery of Art, F1944.46
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