Process for cleaning a photographic processing device

Details Process for cleaning a photographic processing device Process for cleaning a photographic processing device

1990-11-19

1992-06-02

Morris, Theodore

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 2216, 134 28, 134 41, 106 3, 252142, C09G 100, C23G 102, B08B 308

Patent

active

051183560

ABSTRACT:
Photographic processing devices such as stainless steel racks and tanks are cleaned to remove contaminants such as silver by contacting the devices with a cleaning solution comprising water, a mineral acid such as nitric acid, a soluble cerium (IV) salt such as ceric ammonium nitrate, and acetic acid. The cleaning solutions have a pH no greater than 1. The acetic acid inhibits the formation of a brown stain on the stainless steel.

REFERENCES:
patent: 4640713 (1987-02-01), Harris

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