Process for cleaning a photographic process device
AssigneeEastman Kodak Company
InventorsCharles M. Darmon, William G. Henry, Paul A. Schwartz
Life of this patent
Estimating the term…
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 in the stainless steel.
Claims2
A composition suitable for cleaning a stainless steel surface by removal of a silver-containing deposit from such surface without the formation of a brown stain, said composition comprising:
- ______________________________________ water 87-93% Soluble cerium(IV) salt 3-7% nitric acid 2-3% acetic acid 2-3% ______________________________________
Dependencies are inferred from the claim text.