Claims
- 1. A method for preventing oxidation of a developer for silver halide photographic materials and maintaining the pH of said developer constant, which comprises charging a solution of an acid into an anode compartment of an electrolytic cell comprising a cathode, an anode, and a cation exchange membrane disposed therebetween to define a cathode compartment and the anode compartment; and charging the developer into the cathode compartment; and passing a direct electric current between the cathode and the anode.
- 2. A method according to claim 1 wherein the developer is an aqueous solution comprising: a hydroquinone, methyl p-aminophenol sulfate salt, or 1-phenyl-3-pyrazolidone black and white developer
- or an N,N-dialkyl-p-phenylenediamine-type color developer and
- bromine or iodine ions.
Priority Claims (3)
Number |
Date |
Country |
Kind |
49-98922 |
Aug 1974 |
JPX |
|
50-9814 |
Jan 1975 |
JPX |
|
50-22800 |
Feb 1975 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 606,610, filed Aug. 21, 1975 now 4,089,760.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3296112 |
Hollsman |
Jan 1967 |
|
3925175 |
Fisch et al. |
Dec 1975 |
|
4036715 |
Baden et al. |
Jul 1977 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
606610 |
Aug 1975 |
|