Photographic line and half-tone pictures - obtd by introducing oxidising bath after developing

Photographic high contrast pictures, esp. point- or raster picture printing patterns with reduced seams or edges round spots or points, are produced by developing an exposed photographic high contrast element with a developer contg. (a) >=1 dihydroxybenzene, esp. in form of hydroquinone, and (b)...

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Main Authors SUGIYAMA,MITSUNORI, HARA,HIKOHARU, OKUTSU,EIICHI, IWANO,HARUHIKO, IIJIMA,YO, HOSOYA,KATSUMI, ISHIGURO,SHOJI, SUGIYAMA,NOBUO
Format Patent
LanguageEnglish
German
Published 02.08.1973
Edition1
Subjects
AUXILIARY PROCESSES IN PHOTOGRAPHY
CINEMATOGRAPHY
ELECTROGRAPHY
HOLOGRAPHY
PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES
PHOTOGRAPHY
PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES
PHYSICS
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Summary:Photographic high contrast pictures, esp. point- or raster picture printing patterns with reduced seams or edges round spots or points, are produced by developing an exposed photographic high contrast element with a developer contg. (a) >=1 dihydroxybenzene, esp. in form of hydroquinone, and (b) a sulphite ion and opt. a sulphite ion buffer, e.g. an aldehyde- or ketone-bisulphite adduct, and then treating the photographic element with a soln. of an oxidising agent, esp. a bichromate, ferricyanide,persulphate, perchlorate or a complex salt of Fe-(III)-ions. Pref. soln. is used as oxidising bath before fixing and contains an oxidising agent, esp. a brichromate, ferricyanide, persulphate or perchlorate, and a halide, esp. an alkali- or NH4 halide; or as a fixing soln. contg. fixing agent, esp. an alkali- or NH4 thiosulphate, and an oxidising agents, esp. a complex salt of Fe-(III)-ions with an org. acid. esp. EDTA.
Bibliography:Application Number: DE19722202663