Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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disodium pyrophosphate

A chemical (Na 2 P 2 O 7 ) used as a mold inhibitor in paper. It is used in an aqueous solution of 1 1/2 ounces of disodium pyrophosphate, 1/6 ounce of potassium ferrocyanide, and 1/2 ounce of soda crystals in 1 gallon of water. The purpose of the soda crystals is to prevent the paper from turning a greenish hue after treatment. The inhibitor solution may be made up with an addition of gelatin or glue, or other sizing material, if the paper to be treated must be also sized. (198 )

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