While stable enough for most normal uses, the typical fungicide may not be sufficiently stable when it is to re main in paper for decades, even centuries, as paper almost always contain impurities, e.g., iron, which may accelerate the normal slow breakdown of a fungicide. In the usual case, the product of this breakdown is hydrochloric acid (HCl), minute amounts of which are capable of destroying any normal paper; therefore, before using any chlorinated organic fungicide, it must be determined whether or not it is (reasonably) stable in the presence of traces of iron, copper, manganese, etc., and, at the same time sufficiently effective to be of practical value when used in low concentrations, e.g., 0.1% of the weight of the paper. See also: COPPER NAPHTHENATE ;FOXING ;MERCAPTOBENZTHIAZOLE (M.B.T.) ;MERCURIC CHLORIDE ;PENTA-CHLOROPHENOL (P.C.P.) ; SALICYLANILIDE . (198 )
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