Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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mercuric chloride

A colorless, odorless, and non-volatile compound (HgCl2), which is the oldest and perhaps best known of the paper fungicides. It can be applied in an aqueous or non-aqueous solution and is usually used in concentrations as low as 0.1% by weight of the paper. It is liable to liberate hydrochloric acid under certain conditions; however, since it contains only a small percentage of chlorine, and is usually effective in very low concentrations, it is not very likely to be dangerous in this respect. Its major disadvantage is its violently toxic nature, which has led to its use being legally restricted in the United States. (198 , 235 )

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