| (19) |
 |
|
(11) |
EP 0 660 175 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
06.12.1995 Bulletin 1995/49 |
| (43) |
Date of publication A2: |
|
28.06.1995 Bulletin 1995/26 |
| (22) |
Date of filing: 05.12.1994 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT |
| (30) |
Priority: |
22.12.1993 US 168422
|
| (71) |
Applicant: E.I. DU PONT DE NEMOURS AND COMPANY |
|
Wilmington
Delaware 19898 (US) |
|
| (72) |
Inventor: |
|
- Wuelfing, Peter
Arden,
North Carolina 28704 (US)
|
| (74) |
Representative: von Kreisler, Alek, Dipl.-Chem. et al |
|
Patentanwälte
von Kreisler-Selting-Werner
Postfach 10 22 41
50462 Köln
50462 Köln (DE) |
|
| |
|
| (54) |
Control of replanishment during photographic development |
(57) An improved developer and associated replenisher is provided which can be analyzed
in a single non-invasive measurement. One advantage of the improved developer is the
ability to indirectly measure the activity of the developer and replenisher and to
determine if the solutions are properly prepared. These and other advantages are provided
in a system for converting an image-wise exposed silver halide photographic film to
a viewable image comprising: a development means wherein said image-wise exposed silver
halide is reduced to elemental silver with subsequent depletion of said development
means; a fixing means wherein unexposed silver halide is removed from said photographic
film; a replenishing means for said development means wherein said replenishing means
comprises at least two titratably distinct components.