EP 0552511 A1 19930728 - Method for controlling the PH of an ascorbic acid type developer.
Title (en)
Method for controlling the PH of an ascorbic acid type developer.
Title (de)
Verfahren zur pH-Wertkontrolle eines Ascorbinsäureentwicklers.
Title (fr)
Méthode pour contrÔler le pH d'un révélateur de type acide ascorbique.
Publication
Application
Priority
EP 92200148 A 19920120
Abstract (en)
A method is disclosed for developing an exposed radiation-sensitive silver halide material by means of a developing solution containing an ascorbic acid type developing agent, characterized in that the alkalinity of the developing solution is maintained at a desired constant pH level by means of a redox potential measuring system, e.g. a carbon / calomel electrode pair or a platinum / calomel electrode pair. Preferred developing agents are l-ascorbic acid and iso-ascorbic acid. Equally disclosed is an apparatus for maintaining the pH of a ascorbic acid type developer at a constant value comprising a redox electrode system and a control arrangement capable of feeding an alkali solution to the developer.
IPC 1-7
IPC 8 full level
G01N 27/416 (2006.01); G03C 5/30 (2006.01); G03C 5/31 (2006.01); G03D 3/06 (2006.01); G05D 21/00 (2006.01)
CPC (source: EP)
G03C 5/30 (2013.01); G03C 5/31 (2013.01); G03D 3/065 (2013.01)
Citation (search report)
- [AD] FR 2089924 A5 19720107 - IPC SERVICES LTD
- [A] DE 767741 C 19530720 - RZYMKOWSKI JOHANNES DR-ING HAB
- [A] US 3964912 A 19760622 - PRICE HARRY J
- [A] DE 2738981 A1 19780309 - IBM
- [A] US 4505565 A 19850319 - TANAKA HIROSHI [JP]
- [APD] EP 0498968 A1 19920819 - AGFA GEVAERT NV [BE]
- [A] DATABASE WPIL Week 8449, Derwent Publications Ltd., London, GB; AN 84-304553 & JP-A-59 191 035 (FUJI PHOTO FILM KK) 30 October 1984
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 92204039 A 19921221; JP 2061393 A 19930112