Eastman-kodak Company

Peter Anthony Marr

Lewis R Hamilton

Philip Raymond Martell

Jack C Chang

Samuel J Ciurca

Kristine F Ohman

Mary Jane Griggs

Hydrophilic colloids, such as gelatin, which are employed in the manufacture of photographic elements are commonly treated with a hardening composition, among the most useful of which are hardening compositions containing vinyl sulfone hardening agents such as bis(vinylsulfonyl)methane. In accordance with this invention, citric acid or salts of citric acid are utilized as an effective inhibitor of homopolymerization in such hardening compositions.

Stabilized vinyl sulfone hardening compositions useful in photographic

Hydrophilic colloids, such as gelatin, which are employed in the manufacture of photographic elements are commonly treated with a hardening composition, among the most useful of which are hardening compositions containing vinyl sulfone hardening agents such as bis(vinylsulfonyl)methane. In accordance with this invention, a sulfate, such as sodium sulfate, is utilized as both an effective conductivity marker and an effective inhibitor of homopolymerization in such hardening compositions.

Stable nitroxyl radicals are useful as oxidants in photographic elements or film units.

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Webster, NY, United States of America

Peter Anthony Marr