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MCI Project Summaries 2008 - Smithsonian Institution

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<strong>MCI</strong> 5959 Effectiveness of Organic Coatings on Silver Exposed to Hydrogen<br />

Sulfide<br />

<strong>MCI</strong> Staff: Carol A. Grissom, Nicole Grabow, Lynn B. Brostoff, J. Corey Smith, Claire Gervais<br />

Sterling silver coupons and glass slides were coated with fourteen commonly used<br />

coating materials and subjected to a high-sulfide environment until the coupons were severely<br />

tarnished. Of the coatings tested, Agateen® Air Dry Lacquer #27, Acrysol® WS-24, and PVAc<br />

AYAT performed the best, and Renaissance Wax was least effective. Other coatings included<br />

HMG Heat and Waterproof Adhesive, Acryloid® B-72, Acryloid® B-48N, and polyvinyl<br />

butyral resins, retarded tarnish to varying degrees. Thickness of the coating was a significant<br />

variable in performance. A paper summarizing the project has been submitted for publication.<br />

59

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