Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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potassium ferrocyanide

A yellow, crystalline salt (K 4 Fe(CN) 6 ), prepared by the reaction of potassium cyanide with ferrous salts, and used in combination with other substances as a paper fungicide. Although only slightly toxic under normal circumstances, it can form extremely toxic gases if heated strongly or mixed with hot, concentrated acids. Also called "yellow prussiate of potash." (198 )




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