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Tuesday, May 17 • 2:00pm - 2:30pm
(Wooden Artifacts) In Situ Chelation of Waterborne Stains from Historic Unfinished Architectural Woodwork

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New England’s winter of 2014/2015 brought a stunning build-up of snow to the region and the c. 1681 Old Ship Meeting House, a National Historic Landmark in Hingham, Massachusetts was not spared. Ice that formed at the exterior window heads melted and penetrated the wall surfaces resulting in dark staining at the impressive, original interior wooden timber frame members. When testing was initiated seven months following the initial damage, the stains proved to be intractable to simple water removal. Suspecting that this dark reddish staining consisted, at least in part, from aqeuous interactions with ferrous oxides, corrosion from the nongalvanized building nails, BCA designed and tested a custom gelled dual chelator cleaning approach. The procedure proved to be effective at significantly reducing the waterborne stains from the unfinished woodwork without causing any further damage. This presentation will discuss the properties and results of the cleaner BCA produced and utilized on the interior woodwork.

avatar for Melissa K. McGrew

Melissa K. McGrew

Conservator, Building Conservation Associates, Inc.
Ms. McGrew has worked as a conservator at Building Conservation Associates, Inc. since 2001. Her background in art conservation (M.S. University Delaware/ Winterthur Museum) was focused jointly in Architectural and Furniture finish materials and treatments. She has developed and implemented... Read More →

Tuesday May 17, 2016 2:00pm - 2:30pm EDT
Room 514