Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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copper naphthenate

A green cupric salt of naphthenic acid and copper, with the combined fungicidal properties of naphthenic acid and copper. It is practically non-volatile and is used in a 0.1% concentration to control the growth of molds and fungi. There is some risk involved in its use because its presence in paper increases the liability of the paper to damage in a polluted atmosphere, possibly due to the catalytic action of the copper with regard to sulfur dioxide, resulting in the formation of sulfuric acid. (198 )

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