The removal of metal soaps from brass beads on a leather belt

Lyndsie S. Selwyn · W. R. McKinnon · Tara Grant

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Conservation Techniques and Studies Corrosion Behavior and Inhibition Cultural Heritage Materials Analysis

Abstract

Severe corrosion was found covering the brass beads on several beaded belts. The corrosion was a mixture of copper soaps and zinc soaps, and was so thick in some places that it completely buried the brass beads. One of these belts was chosen as a test case for cleaning. The details of the cleaning are described, as are the effects of the corrosion process on the beads and surrounding organic materials. Two supporting studies are also reported: tests of the solubility of the corrosion in a variety of organic solvents, including mixtures of ethanol and petroleum-based solvents; and tests of leather dressings and other coatings on brass, copper, and zinc coupons in various relative humidities (RH), to determine what values of RH could be recommended for storage.

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References

2003Annual Book of ASTM Standards 2003 1988The Organic Chemistry of Museum Objects 2003The Characterization of Metal Soaps 2006Conservation of Leather and Related Materials 2003A New Methodology for Accelerated Corrosion Testing 2002The Swelling of Artists' Paints in Organic Solvents. Part 2, Comparative Swelling Powers of Selected Organic Solvents and Solvent Mixtures 1987The Corrosion and Conservation of Metallic Antiquities and Works of Art 1957The Conservation of Antiquities and Works of Art: Treatment Repair and Restoration

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