Claims
- 1. A two-part aqueous black-and-white developing composition kit comprising:a) an aqueous first solution having a pH of from about 3 to about 6 that is essentially free of dihydroxybenzene compounds and comprises: at least 0.05 mol/l of an ascorbic acid developing agent, a water-miscible hydroxy-containing organic solvent having a molecular weight of from about 50 to about 200, the weight ratio of said organic solvent to water being from about 0.05:1 to about 8:1, and at least 0.0005 mol/l of a 3-pyrazolidone co-developing agent, and b) a second aqueous solution having a pH of from about 8 to about 12 and comprising a borate buffer and at least 0.05 mol/l of sulfite ions.
- 2. The developing composition kit of claim 1 wherein the weight ratio of said organic solvent to water is from about 0.1:1 to about 1:1 in said aqueous first solution.
- 3. The developing composition kit of claim 1 wherein said organic solvent is an alcohol or glycol.
- 4. The developing composition kit of claim 3 wherein said organic solvent is ethylene glycol, diethylene glycol, propylene glycol, ethanol, benzyl alcohol, triethylene glycol, or polyethylene glycol.
- 5. The developing composition kit of claim 1 wherein said first aqueous solution has a pH of from about 4.5 to about 5.5 and is essentially free of dihydroxybenzene compounds and comprises:a) from about 0.2 to about 1 mol/l of an ascorbic acid developing agent, b) a water-miscible hydroxy-containing organic solvent having a molecular weight of from about 50 to about 200, the weight ratio of said organic solvent to water being from about 0.1:1 to about 1:1, c) from about 0.001 to about 0.2 mol/l of sulfite ions, d) from about 0.0005 to about 0.02 mol/l of a 3-pyrazolidone co-developing agent, and e) up to 0.2 mol/l of a buffer, and said second aqueous solution has a pH of from about 9 to about 11 and comprises from about 0.1 to about 0.4 mol/l of sulfite ions, and from about 0.1 to about 0.4 mol/l of a buffer.
- 6. The developing composition kit of claim 5 wherein said buffer in said second aqueous solution is a borate, and said organic solvent is ethylene glycol or diethylene glycol.
- 7. The developing composition kit of claim 1 wherein said organic solvent has a molecular weight of from about 100 to about 200.
- 8. The developing composition kit of claim 1 wherein said organic solvent has a molecular weight of from about 50 to about 150.
CROSS-REFERENCE TO RELATED APPLICATION
This is a Divisional of application 10/000,893 filed Nov. 2, 2001, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 603 586 |
Jun 1994 |
EP |
0 774 687 |
May 1997 |
EP |
0 777 150 |
Jun 1997 |
EP |
Non-Patent Literature Citations (1)
Entry |
JP Abstract 2000-292890 (Fuji). |