US1970869A - Photographic reversal development - Google Patents
Photographic reversal development Download PDFInfo
- Publication number
- US1970869A US1970869A US586969A US58696932A US1970869A US 1970869 A US1970869 A US 1970869A US 586969 A US586969 A US 586969A US 58696932 A US58696932 A US 58696932A US 1970869 A US1970869 A US 1970869A
- Authority
- US
- United States
- Prior art keywords
- reversal development
- development
- photographic
- photographic reversal
- odourless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000003464 sulfur compounds Chemical class 0.000 description 7
- HTKFORQRBXIQHD-UHFFFAOYSA-N allylthiourea Chemical compound NC(=S)NCC=C HTKFORQRBXIQHD-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 4
- 229910052946 acanthite Inorganic materials 0.000 description 3
- XUARKZBEFFVFRG-UHFFFAOYSA-N silver sulfide Chemical compound [S-2].[Ag+].[Ag+] XUARKZBEFFVFRG-UHFFFAOYSA-N 0.000 description 3
- 229940056910 silver sulfide Drugs 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 244000052616 bacterial pathogen Species 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 silver halide Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/50—Reversal development; Contact processes
Definitions
- odourless sulfur compound which does not color the finished picture or the binding agent and is capable of forming developable nuclei of silver sulfide.
- the known alkaline developer when the second exposure is omitted produces a blackening oifthe silver halide only after at least minutes
- the alkaline developer mixed with a small quantity of an odourless I sulfur compound, for instance, thiosinamine or ,thiourea produces the silver picturealready after one minute.
- Odourless sulfur compounds are, besides the thiosinamine already mentioned, thiourea and other sulfur compounds capable of forming germs of silver sulfide.
- the following example illustrates the invenion: 1000 cc. of the known metol-hydroquinone-developer, as it is utilized in the reversal development ⁇ or the first negative development, are mixed with 0.5 gram of thiosinamine.
- ver halide which remains in the Layer after the treatment with the reversal bath consisting of bichromate and sulfuric acid is blackened by the odourless solution in less than one minute.
- the tint of the silver picture is very similar to that of a picture produced with a pure alkali sulfide.
- the requisite odorless sulfur compound may be mixed with the developer in solid form, so that a solid developer in accordance with my invention may be placed on the market.
- the reversal process may be carried out in any known manner, so, for instance, after the firstdeveloping operation a clearing bath may be introduced.
- the step which comprises, after a first development and bleaching of a photographic material, effecting a second development with an alkaline developer containing a small quantity of an odourless sulfur compound capable of forming germs of silver sulfide.
- the step which comprises, after a first development and bleaching 01' a photographic material, eftecting a second development with an alkaline developer containing a small quantity of thiosinamine.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Patented Aug. 21, 1934 UNITED STATES PATENT- OFFICE on-the-Rhine,
Germany,
assignor to Alia Ansco Corporation, Binghamton, N. Y., a corporation of New York No Drawing. Application January 15, 1932,
Serial No. 586,969. In Germany I 3 Claims.
odourless sulfur compound which does not color the finished picture or the binding agent and is capable of forming developable nuclei of silver sulfide. Whereas the known alkaline developer when the second exposure is omitted, produces a blackening oifthe silver halide only after at least minutes, the alkaline developer mixed with a small quantity of an odourless I sulfur compound, for instance, thiosinamine or ,thiourea, produces the silver picturealready after one minute. The sulfur compound alone in the low concentration, in which it is present, would not be able to blacken the silver halide. Odourless sulfur compounds are, besides the thiosinamine already mentioned, thiourea and other sulfur compounds capable of forming germs of silver sulfide. t The following example illustrates the invenion: 1000 cc. of the known metol-hydroquinone-developer, as it is utilized in the reversal development {or the first negative development, are mixed with 0.5 gram of thiosinamine. The silanuary 17,
ver halide which remains in the Layer after the treatment with the reversal bath consisting of bichromate and sulfuric acid is blackened by the odourless solution in less than one minute. The tint of the silver picture is very similar to that of a picture produced with a pure alkali sulfide.
The requisite odorless sulfur compound may be mixed with the developer in solid form, so that a solid developer in accordance with my invention may be placed on the market.
The reversal process may be carried out in any known manner, so, for instance, after the firstdeveloping operation a clearing bath may be introduced.
What I claim is:
1. In the photographic reversal process the step which comprises, after a first development and bleaching of a photographic material, effecting a second development with an alkaline developer containing a small quantity of an odourless sulfur compound capable of forming germs of silver sulfide. v
2. In the photographic reversal process the step which comprises, after a first development and bleaching 01' a photographic material, eftecting a second development with an alkaline developer containing a small quantity of thiosinamine.
3. In the photographic reversal process the
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE382815X | 1931-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1970869A true US1970869A (en) | 1934-08-21 |
Family
ID=6361165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US586969A Expired - Lifetime US1970869A (en) | 1931-01-17 | 1932-01-15 | Photographic reversal development |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1970869A (en) |
| FR (1) | FR729871A (en) |
| GB (1) | GB382815A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3666648A (en) * | 1969-11-05 | 1972-05-30 | Ibm | In-situ reclamation of master patterns for printing microcircuit images on reversely sensitized material |
| US4186009A (en) * | 1978-05-30 | 1980-01-29 | Eastman Kodak Company | Covering power photothermographic material and process |
-
1932
- 1932-01-15 US US586969A patent/US1970869A/en not_active Expired - Lifetime
- 1932-01-16 FR FR729871D patent/FR729871A/en not_active Expired
- 1932-01-18 GB GB1481/32A patent/GB382815A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3666648A (en) * | 1969-11-05 | 1972-05-30 | Ibm | In-situ reclamation of master patterns for printing microcircuit images on reversely sensitized material |
| US4186009A (en) * | 1978-05-30 | 1980-01-29 | Eastman Kodak Company | Covering power photothermographic material and process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB382815A (en) | 1932-11-03 |
| FR729871A (en) | 1932-08-02 |
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