MARIE STEWART
Kariate
Kariate, Nancy Graves, National Gallery of Art, Before Treatment
Kariate, a sculpture by Nancy Graves, was treated after a condition examination was completed on it before it was to be moved to offsite storage. It is made up of a flat metal base, on top of which three groups of metal figures stand. Silver-painted metal rods rise up from the figures and curve in different directions. Various types and sizes of wire and wire mesh are twisted around the metal rods. The wire mesh is attached to the metal rods with pink-painted washers and rivets. Brass-colored wire runs through small green-painted metal elements as it curves through the wire mesh. Certain pieces of wire mesh are painted with blue and white circles.
When I examined the sculpture, I found white, powdery material present on some surfaces of the brass-colored wire. A sample of the material was analyzed and determined to be from excess flux from soldering that was not cleaned off of the metal when the object was finished. Over time, the hygroscopic material expanded to a white, powdery form.
Several of the green-painted elements that are close to the white flux had flaking and powdering paint. Excess flux was probably present in these areas and caused the paint to loosen and flake.
Testing to determine the best way to remove the white flux material was carried out and was found to be the application of an aqueous gel to the material to soften it and then mechanically remove it with short stiff brushes, small picks, and scalpels. After this, the area was cleared with water dampened swabs. In areas where the flux material was adjacent to the green painted elements, it was removed by mechanical means only, as the paint was water-soluble.
More testing was performed to find the right adhesive to stabilize the flaking green paint; 3% Paraloid B-72 in acetone-ethanol was used in two applications.Finally, while treating the sculpture, it was determined that the wire was coated with a translucent material. After the treatment was finished, a new coating of B-48N was applied to the wire.
Kariate, Nancy Graves, National Gallery of Art, Stabilizing lifting paint
Kariate, Nancy Graves, National Gallery of Art White, powdery material on brass wire
Kariate, Nancy Graves, National Gallery of Art, Lifting paint
Kariate, Nancy Graves, National Gallery of Art, Detail Before Treatment
Kariate, Nancy Graves, National Gallery of Art, Detail Before Treatment
Kariate, Nancy Graves, National Gallery of Art, Detail After Treatment
Kariate, Nancy Graves, National Gallery of Art, Detail After Treatment
Kariate, Nancy Graves, National Gallery of Art, Removing excess flux material