BE502525A - - Google Patents
Info
- Publication number
- BE502525A BE502525A BE502525DA BE502525A BE 502525 A BE502525 A BE 502525A BE 502525D A BE502525D A BE 502525DA BE 502525 A BE502525 A BE 502525A
- Authority
- BE
- Belgium
- Prior art keywords
- mercaptotetrazols
- silver halide
- layer
- compounds
- transfer layer
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
- G03C8/24—Photosensitive materials characterised by the image-receiving section
- G03C8/243—Toners for the silver image
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/166—Toner containing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Description
<Desc/Clms Page number 1>
PROCEDE .POUR LA PRODUCTION .DIRECTE-D'IMAGES POSITIVES.
Dans le brevet fraçais No. 879 995 est décrit un procédé pour la production directe d'images Positives., suivant lequel h'halogénure d'ar- gent non exposée et par suite non développable, d'une couche photographique est dissous pendant le développement de l'halogénure d'argent exposée et transféré par diffusion dans une autre couche de transfert non photosensible qui est en contact étroit avec la couche négative d'halogénure d'argent et développé dans cette couche sous l'action catalytique de germes de dévelop- pement présents dans cette couche pour former une image positive.
La signi- fication des termes "négatif" et "positif" employés dans cette description est relative dans ce sens qu'un négatif direct est formé dans la couche de transfert lorsque la couche d'émulsion est exposée à un objet négatif, alors qu'on obtient dans cette couche de transfert un positif direct, lorsque la couche d'émulsion est exposée à un objet positif.
On avait déjà signalé dans ce brevet que le développement de la couche d'halogénure d'argent et de la couche de transfert s'effectue avanta- geusement en présence de composés qui influent sur la'nuance de couleur de l'argent séparé dans la couche de transfert. Des composés de ce genre sont décrits dans le brevet allemand No.473 000.Ils ont la propriété de former des sels d'argent difficilement solubles dans l'eau et dans le thiosulfate de odium. Lorsque le procédé est exécuté en l'absence de ces composés, on obtient sur les couches de transfert des images argentiques en une couleur allant du jaune au brun d'un aspect de peu d'apparence, alors que l'addition des substances mentionnées dans le brevet allemand No. 473 000 fait virer la couleur de l'image vers le noir.
Ce procédé pour la production directe d'images positives n'a pas donné satisfaction entière dans la forme ci- dessus décrite. En effet, les substances influant sur la tonalité de l'image, employées jusqu'ici, avaient bien la propriété de faire virer du jaune au noir le ton de l'image argentique positive des parties fortement recouver-
<Desc/Clms Page number 2>
tes,mais présentaient l'inconvénient de laisser pratiquement inchangée la tonalité des parties faiblement recouvertes. Un autre inconvénient des sub- stances employées jusqu'ici, pour influencer la tonalité de l'image réside dans le fait qu'elles avaient pour effet un raidissement indésirable de la gradation de l'image positive.
<Desc / Clms Page number 1>
PROCESS FOR THE DIRECT PRODUCTION OF POSITIVE IMAGES.
In French patent No. 879,995, a process for the direct production of positive images is described, according to which the unexposed and therefore non-developable silver halide of a photographic layer is dissolved during development. silver halide exposed and transferred by diffusion into another non-photosensitive transfer layer which is in close contact with the negative silver halide layer and developed in this layer under the catalytic action of development seeds. pement present in this layer to form a positive image.
The meaning of the terms "negative" and "positive" employed in this specification is relative in that a direct negative is formed in the transfer layer when the emulsion layer is exposed to a negative object, while a direct positive is obtained in this transfer layer when the emulsion layer is exposed to a positive object.
It was already pointed out in this patent that the development of the silver halide layer and of the transfer layer takes place advantageously in the presence of compounds which influence the color tone of the silver separated in the film. transfer layer. Compounds of this kind are described in German Patent No. 473,000. They have the property of forming silver salts which are hardly soluble in water and in sodium thiosulphate. When the process is carried out in the absence of these compounds, there are obtained on the transfer layers silver images in a color ranging from yellow to brown with an appearance of little appearance, while the addition of the substances mentioned in German Patent No. 473,000 turns the color of the image to black.
This process for the direct production of positive images has not been entirely satisfactory in the form described above. In fact, the substances influencing the tonality of the image, used up to now, had the property of causing the tone of the positive silver image to turn from yellow to black in parts that are heavily covered.
<Desc / Clms Page number 2>
tes, but had the disadvantage of leaving the tonality of the weakly covered parts practically unchanged. Another drawback of the substances heretofore employed to influence the tonality of the image is that they have the effect of undesirably stiffening the gradation of the positive image.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE502525T | |||
US156230A US2699393A (en) | 1950-04-15 | 1950-04-15 | Photographic process for the direct production of positive images |
Publications (1)
Publication Number | Publication Date |
---|---|
BE502525A true BE502525A (en) |
Family
ID=78668846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE502525D BE502525A (en) | 1950-04-15 |
Country Status (6)
Country | Link |
---|---|
US (1) | US2699393A (en) |
BE (1) | BE502525A (en) |
CH (1) | CH282754A (en) |
DE (1) | DE890755C (en) |
FR (1) | FR1055844A (en) |
GB (1) | GB695905A (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2774667A (en) * | 1951-07-02 | 1956-12-18 | Polaroid Corp | Photographic silver halide transfer process |
FR1102942A (en) * | 1955-10-31 | 1955-10-27 | Kodak Pathe | Photographic reproduction process and new products for its implementation |
BE557693A (en) * | 1956-05-23 | |||
DE1070029B (en) * | 1958-03-31 | 1959-11-26 | ||
NL123870C (en) * | 1958-11-28 | |||
BE590106A (en) * | 1959-04-28 | |||
US3060022A (en) * | 1959-07-13 | 1962-10-23 | Gen Aniline & Film Corp | Image transfer process |
BE593815A (en) * | 1959-08-06 | |||
GB888543A (en) * | 1959-10-16 | 1962-01-31 | Kodak Ltd | Improvements in processes of photographic reproduction |
US3080254A (en) * | 1959-10-26 | 1963-03-05 | Minnesota Mining & Mfg | Heat-sensitive copying-paper |
BE597026A (en) * | 1959-11-14 | |||
US3068098A (en) * | 1960-03-23 | 1962-12-11 | Eastman Kodak Co | Photographic diffusion transfer process |
US3177792A (en) * | 1960-04-06 | 1965-04-13 | Itek Corp | Photographic print processing apparatus |
FR83752E (en) * | 1960-11-23 | 1965-01-15 | ||
US3173789A (en) * | 1962-01-29 | 1965-03-16 | Eastman Kodak Co | Method and composition for inhibiting silver sludge in thiosulfate monobaths |
BE629344A (en) * | 1962-03-10 | |||
GB1066215A (en) * | 1962-11-12 | 1967-04-26 | Fuji Photo Film Co Ltd | Improvement in or relating to silver salt diffusion transfer photographic materials |
US3655380A (en) * | 1970-01-14 | 1972-04-11 | Eastman Kodak Co | Diffusion transfer product and process containing 5-seleno-1,2,3,4-tetrazole |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE444702A (en) * | 1941-01-24 | |||
US2352014A (en) * | 1941-07-21 | 1944-06-20 | Rott Andre | Photomechanical printing process and printing material for carrying out the same |
GB561875A (en) * | 1942-12-03 | 1944-06-08 | John David Kendall | Improvements in or relating to photographic materials |
GB573105A (en) * | 1943-11-26 | 1945-11-06 | Leonard Vincent Chilton | Improvements in or relating to photographic materials |
GB573745A (en) * | 1944-02-03 | 1945-12-04 | Wilfrid Hampden Dimsdale | Improvements in or relating to photographic light-sensitive elements |
BE463544A (en) * | 1944-02-03 |
-
0
- BE BE502525D patent/BE502525A/fr unknown
-
1950
- 1950-04-15 CH CH282754D patent/CH282754A/en unknown
- 1950-04-15 US US156230A patent/US2699393A/en not_active Expired - Lifetime
-
1951
- 1951-03-11 DE DE1951890755D patent/DE890755C/en not_active Expired
- 1951-04-12 FR FR1055844D patent/FR1055844A/en not_active Expired
- 1951-04-16 GB GB8855/51A patent/GB695905A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB695905A (en) | 1953-08-19 |
FR1055844A (en) | 1954-02-22 |
CH282754A (en) | 1952-05-15 |
DE890755C (en) | 1953-09-21 |
US2699393A (en) | 1955-01-11 |
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