Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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sodium thiosulfate

A salt (Na 2 S 2 O 3 ). prepared by treating a solution containing sodium carbonate and sodium sulfide with sulfur dioxide, or by boiling sodium sulfite with sulfur. It is used extensively in photography because of the ability of its solutions to dissolve silver halides, and as an anti-chlor when sodium hypochlorite is used in bleaching archival papers. It is also used extensively in the chrome tannage of leather. (144 , 306 )




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