US1029511A - Process of developing photographic plates and films. - Google Patents
Process of developing photographic plates and films. Download PDFInfo
- Publication number
- US1029511A US1029511A US65217911A US1911652179A US1029511A US 1029511 A US1029511 A US 1029511A US 65217911 A US65217911 A US 65217911A US 1911652179 A US1911652179 A US 1911652179A US 1029511 A US1029511 A US 1029511A
- Authority
- US
- United States
- Prior art keywords
- plate
- films
- film
- photographic plates
- bath
- 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
- 238000000034 method Methods 0.000 title description 12
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 8
- 229910052753 mercury Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 239000010979 ruby Substances 0.000 description 4
- 229910001750 ruby Inorganic materials 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- ZVNPWFOVUDMGRP-UHFFFAOYSA-N 4-methylaminophenol sulfate Chemical compound OS(O)(=O)=O.CNC1=CC=C(O)C=C1.CNC1=CC=C(O)C=C1 ZVNPWFOVUDMGRP-UHFFFAOYSA-N 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 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
- G03C5/38—Fixing; Developing-fixing; Hardening-fixing
- G03C5/386—Hardening-fixing
Definitions
- PROCESS OF DEVELOPING PHOTOGRAPHIC PLATES AND FILMS PROCESS OF DEVELOPING PHOTOGRAPHIC PLATES AND FILMS.
- This process is particularly,but not necessarily exclusively, adapted to the developments of plates or films which are sensitive to all colors, and the invention has for its principal object to enable a plate which has been inserted in a plate-holder in the ordinary manner, to be removed from the plate-holder, or a film removed from the camera, in subdued daylight, twilight, or subdued artificial light, and said plate or film developed in subdued daylight or art-ificial light without any necessity for a dark room or ruby light.
- the plate or film after having been removed from the plateholder or camera is, in subdued actinic light, such as daylight or artificial light, immersed in a bath (which may be in an open tray), said bath consisting of a developer, such as metol developer for example, and bichlorid of mercury.
- a bath which may be in an open tray
- said bath consisting of a developer, such as metol developer for example, and bichlorid of mercury.
- sodium chlorid is employed in connection with the bichlorid of mercury since it very materially increases the solubility of the bichlorid, the water, bichlorid of mercury and sodium chlorid being mingled in substantially the following proportions viz., 16 parts water, 1 part bichlorid of mercury and 1 part salt, the said compound and developer being mingled and being in substantially the proportions of one to four parts of the compound to sixty-four parts of the developer. While this plate is being immersed in the bath in the open tray, no dark room or ruby light is necessary. Second, the plate or film is removed from the above mentioned bath and washed in water or other suit-able liquid. Third, the plate or film is placed in an ordinary fixing bath of, say, sodium thiosulfate and water. The
- subdued artificial light or subdued daylight may be developed without the employment of a dark room or ruby light, but by subdued actinic light, doing away with halation. Moreover, as an over-exposure, unless excessive, is not injurious, the objects in shadows, or the subshadows, are brought out with a greater degree of detail.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
UNITED STATES PATENT OFFICE.
HARRY M. PRINDLE, F BOSTON, MASSACHUSETTS, ASSIGNOR T0 ALFRED H. HILDRETH, TRUSTEE, 0F CAMBRIDGE, MASSACHUSETTS.
PROCESS OF DEVELOPING PHOTOGRAPHIC PLATES AND FILMS.
Specification of Letters Patent. No Drawing. Application filed May 19, 1904, Serial No. 208,739. Renewed September 30, 1911. Serial Patented June 11, 1912.
' a citizen of the United States, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Processes of Developing Photographic Plates and Films, of which the following is a specification.
This process is particularly,but not necessarily exclusively, adapted to the developments of plates or films which are sensitive to all colors, and the invention has for its principal object to enable a plate which has been inserted in a plate-holder in the ordinary manner, to be removed from the plate-holder, or a film removed from the camera, in subdued daylight, twilight, or subdued artificial light, and said plate or film developed in subdued daylight or art-ificial light without any necessity for a dark room or ruby light.
In my process :first, the plate or film after having been removed from the plateholder or camera is, in subdued actinic light, such as daylight or artificial light, immersed in a bath (which may be in an open tray), said bath consisting of a developer, such as metol developer for example, and bichlorid of mercury. Preferably sodium chlorid is employed in connection with the bichlorid of mercury since it very materially increases the solubility of the bichlorid, the water, bichlorid of mercury and sodium chlorid being mingled in substantially the following proportions viz., 16 parts water, 1 part bichlorid of mercury and 1 part salt, the said compound and developer being mingled and being in substantially the proportions of one to four parts of the compound to sixty-four parts of the developer. While this plate is being immersed in the bath in the open tray, no dark room or ruby light is necessary. Second, the plate or film is removed from the above mentioned bath and washed in water or other suit-able liquid. Third, the plate or film is placed in an ordinary fixing bath of, say, sodium thiosulfate and water. The
second and third steps are old in themselves considered.
By means of this process a plate which is sensitive to colors, such as a Carbutt polychromatlc plate, which has been inserted in v the plate-holder in the ordinary manner, and
removed therefrom" in subdued artificial light or subdued daylight, may be developed without the employment of a dark room or ruby light, but by subdued actinic light, doing away with halation. Moreover, as an over-exposure, unless excessive, is not injurious, the objects in shadows, or the subshadows, are brought out with a greater degree of detail.
This process is especially valuable where plates or films have been accidentally ex posed to the light so that they are lightstruck or fogged either before or after they have been exposed in the camera, many of such plates giving good results when developed according to this process.
Of course the steps in this process may be taken in darkness or by ruby light, but no better efiect is produced by so doing.
Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is
1. The process of original development of photographic plates or films, consisting in immersing the plate or film in a bath comprising water, bichlorid of mercury, sodium chlorid, and a developer; washing the plate or film; and placing the plate or film in a fixing bath, substantially as herein described.
2. The process of original development of photographic plates or films, consisting in immersing the plate or film while in subdued actinic light, in a bath comprising water, bichlorid of mercury, sodium chlorid. and a developer; washing the plate or film; and placing the plate or filmin a fixing bath, substantially as herein described.
8. The process of original development of photographic plates or films, consisting in immersing the plate or film, while in subdued actinic light, in an open or exposed bath comprising water, bichlorid of mercury, sodium chlorid, and a developer; washing the plate or film; and placing the plate or film in a fixing bath, substantially as herein described.
4. The process of original development of photographic plates or films consisting in name to this specification in the presence immersing the plate or film in a bath comof two subscribing Witnesses.
prising Water, bichlorid of mercury and a HARRY M. PRINDLE. developer and thereafter fixing the plate or Witnesses: 5 film. HENRY W. WILLIAMS,
In testimony whereof I have signed my A. K. HOOD.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65217911A US1029511A (en) | 1911-09-30 | 1911-09-30 | Process of developing photographic plates and films. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US65217911A US1029511A (en) | 1911-09-30 | 1911-09-30 | Process of developing photographic plates and films. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1029511A true US1029511A (en) | 1912-06-11 |
Family
ID=3097804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US65217911A Expired - Lifetime US1029511A (en) | 1911-09-30 | 1911-09-30 | Process of developing photographic plates and films. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1029511A (en) |
-
1911
- 1911-09-30 US US65217911A patent/US1029511A/en not_active Expired - Lifetime
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