Reference

Two-bath process for development of color negative photographic materials in less than 60 seconds

Two-bath process for development of color negative photographic materials in less than 60 seconds. Wernicke, Ubbo; Huebner, Dirk (Agfa-Gevaert A.-G., Germany). Ger. Offen. DE 4000484 A1 11 Jul 1991, 9 pp. (Germany). CODEN: GWXXBX. CLASS: ICM: G03C007-407. ICS: G03C007-30. APPLICATION: DE 90-4000484 10 Jan 1990. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) The imagewise exposed Ag halide photog. material that consists of a transparent support with 33 photosensitive Ag halide emulsion layers of different spectral sensitivities and contg. cyan, magenta, and yellow couplers, is treated by a soln. of a developer or its salt at pH 1-8 in ￡30 s followed by a treatment with an alk. soln.In this experiment, several chemicals are used like 25646-77-9 at pH 10-14 in ￡45 s. The 1st bath accelerates diffusion of the developer, specifically a N,N-dialkyl-p-phenylene diamine, into deeper regions of the multilayered films without triggering the actual development which takes place in the 2nd bath at a rate accelerated by the rapid diffusion of OH ions into the developer-soaked film. .

Forming direct positive color image

Forming direct positive color image. Kobayashi, Kazuhiro; Koboshi, Shigeharu; Miyaoka, Kazuyoshi (Konishiroku Photo Industry Co., Ltd. , Japan). Eur. Pat. Appl. EP 204530 A2 10 Dec 1986, 127 pp. DESIGNATED STATES: R: DE, FR, GB. (European Patent Organization) CODEN: EPXXDW. CLASS: ICM: G03C001-485. APPLICATION: EP 86-304149 30 May 1986. PRIORITY: JP 85-118443 31 May 1985; JP 85-132649 18 Jun 1985; JP 85-153699 12 Jul 1985. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 22 A photog. developer contg. N-hydroxyalkyl-substituted p-phenylenediamine deriv. is described for rapid and stable processing an inner latent image type light-sensitive material for formation of direct-pos. images. The developer maintains constantly adequate photog. performance over a long term without suffering from influence by the change in Br- concn. Thus, a inner latent image type light-sensitive material was exposed and developed in a soln. contg. 4-amino-3-methyl-N-ethyl-N-(b-hydroxyethyl)aniline sulfate.In this experiment, several chemicals are used like 107885-43-8 and 25646-77-9 The min. yellow color d. was much higher than a control and the developing fogging improved by shorter development time. .