Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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penta-chlorophenol ( p.c.p. )

A crystalline compound (C 6 C 15 OH), produced by the reaction of hexachlorobenzene with sodium hydroxide, or of chlorine with phenol, and used, in concentrations of 0.1% by weight of the paper, as a fungicide. It is applicable either as an aqueous or non-aqueous solution. Being a highly chlorinated substance, it must be used in the presence of sufficient alkali to compensate for the probable liberation of hydrochloric acid, or in such small quantities, i.e., less than 0.1%, so as not to endanger the paper severely even if it does decompose slightly. To avoid the danger of acidity, p.c.p. is sometimes used as the sodium salt, sodium pentachlorophenate, which is less likely to produce difficulty because of acidity. P.c.p. is colorless and is not likely to produce an appreciable odor. (198 )

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