Saturday, January 19
1:00 p.m. –2:00 p.m.
Metzker cover
KEITH F. DAVIS, author of The Photographs of Ray K. Metzker, published by the Nelson-Atkins
Museum of Art.

Sunday, January 20
1:00 p.m. –2:00 p.m.
Parker Cover
JENNIFER A.WATTS, editor of Maynard L. Parker: Modern Photography and the American Dream, published by the Huntington Library.


Is your photograph Platinum, Palladium, Silver...?

Saturday, January 19
1:00 p.m. – 5:00 pm

Sunday, January 20
1:00 p.m. –4:00 p.m.

GAWAIN WEAVER, photograph conservator will be offering complementary XRF analysis to individuals who bring their own photographs to Classic Photographs Los Angeles. Other photographic process identification questions and discussions are also welcome! There is a limit of two photographs per person.

When he’s not analyzing photographs with a microscope or XRF, Gawain is teaching workshops on the care and identification of photographs or conserving/restoring photographs at his studio in the San Francisco Bay Area.

X-ray Fluorescence Spectroscopy (usually just “XRF”) is an analytical technique used to determine the elements present in a sample. In art conservation, XRF is often used to determine the identity of pigments in a painting, the image metal or toners in a photograph, or the alloys in a metal sculpture.

XRF is particularly useful in photography for identifying the presence of absence of image forming elements such as silver, platinum, palladium, and iron. Toners such as selenium, sulfur, and iron can also be detected. Common uses of the XRF include differentiating between platinum, palladium, and pt/pd prints, detecting the trace quantities of silver present in a crayon enlargement, identifying the use of unusual toners such as mercury or uranium, confirming the presence (or absence) of a platinum image in turn of the century gum-over-platinum prints,  and the identification of bronze powder as the pigment in Edward Curtis Orotones. New uses of XRF analysis are being discovered all the time.

Special Events from the 2013 Show