Back to results
US 2003/0148229 A1Published application
Photographic wash solution and process
AssigneeEastman Kodak Company
InventorsJohn R. Fyson, Jeffrey L. Hall, Peter J. Twist
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEastman Kodak Company
InventorsJohn R. Fyson, Jeffrey L. Hall, Peter J. Twist
Estimating the term…
A photographic washing bath comprises a chamber containing a wash solution for a silver halide photographic material having a pH of less than 7 and comprising water having dissolved therein an oxidizing agent, said oxidizing agent having an oxidizing potential of at least 1 volt and being in a concentration of from 0.05 to 2 Molar. The oxidation potential of the oxidizing agent is preferably at least 1.2 volts and may be hydrogen peroxide or a source of hydrogen peroxide, a persulphate, a perborate, a bromate, or an iodate. A washing process using the invention is suitable for being carried out in same chamber as the development and fixing stages in which case hydrogen peroxide is the preferred oxidizing agent because any peroxide remaining at the end of the wash stage can be removed by evaporation, thereby avoiding risk of contamination of the next stage to be carried out in the chamber.
A photographic washing bath comprising a chamber containing a wash solution for a silver halide photographic material said wash solution having a pH of less than 7 and comprising water having dissolved therein an oxidizing agent, said oxidizing agent having an oxidizing potential of at least 1 volt and being in a concentration of from 0.05 to 2 Molar.
A photographic washing process which process comprises washing a silver halide photographic material which has been subjected to the stages of development, bleaching and fixing, said washing being carried out in a photographic washing bath comprising a chamber containing a wash solution for a silver halide photographic material said wash solution having a pH of less than 7 and comprising water having dissolved therein an oxidizing agent, said oxidizing agent having an oxidizing potential of at least 1 volt and being in a concentration of from 0.05 to 2 Molar and where the temperature of the wash solution is not greater than 80 degrees Centigrade and the contact time is from 5 seconds to 2 minutes.
A photographic washing process where the development, bleaching and fixing have been carried out in the same chamber and which process comprises washing the photographic material outside the chamber and adding oxidizing agent to the chamber to oxidize contaminants from the fixing stage.
Dependencies are inferred from the claim text.