News from the Conservation Lab — Stone Survey!

By Caroline Roberts, Conservator

This summer I’m embarking on a condition survey of the Kelsey’s stone collection, a big project both in scope and in terms of artifact size. As I mentioned in our latest Ugly Object post (ancient earplugs!) the Kelsey’s stone collection is wide-ranging, including everything from tiny steatite scarabs to massive column drums the size of tree trunks. My survey will focus on the larger-scale artifacts and will include vessels, sculpture, and architectural elements made of stone. My goals are to identify which of these artifacts are most in need of conservation intervention, and in the process learn what I can about past stone conservation treatments.

woman with clipboard
Carrie examines stone artifacts in the Kelsey’s collections storage.

The project is a continuation of previous condition surveys conducted by Suzanne Davis, Claudia Chemello, and LeeAnn Barnes Gordon. Their work serves as a valuable baseline for how the Kelsey’s stone artifacts might have changed over the past ten years. Gordon’s research also revealed information about how newly excavated stone was treated at the Roman-Egyptian site of Terenouthis. In the early twentieth century, archaeological chemist Alfred Lucas introduced polymeric materials to archaeologists’ conservation toolkit. Among these was Duco cement, a cellulose nitrate adhesive that was applied to many of the stelae discovered at Terenouthis in order to prevent rapid surface deterioration following excavation. The Duco coating has, however, started to deteriorate, compromising the very surfaces it was meant to protect. Information about historic conservation treatments, along with new condition rankings, will help me develop preservation and treatment plans for the most at-risk stone artifacts at the Kelsey.

stone stela in situ.
Limestone stela during excavation at Terenouthis, Egypt. Kelsey Museum Photo Caption Database.

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