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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