US2262986A - Photographic backing paper - Google Patents
Photographic backing paper Download PDFInfo
- Publication number
- US2262986A US2262986A US364061A US36406140A US2262986A US 2262986 A US2262986 A US 2262986A US 364061 A US364061 A US 364061A US 36406140 A US36406140 A US 36406140A US 2262986 A US2262986 A US 2262986A
- Authority
- US
- United States
- Prior art keywords
- backing paper
- photographic
- ink
- film
- sodium
- 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
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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
- G03C3/00—Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives
- G03C3/02—Photographic roll-films with paper strips
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/04—Printing inks based on proteins
Definitions
- This invention relatesto photographic backing paper, and more particularly to the ink with which photographic backing paper is marked.
- the accompanying drawing shows a section of two convolutions of film with an interposed layer of backing paper, as it occurs in a roll film cartridge.
- I represents the film base, carrying the emulsion 2, 2.
- 3 represents the backing paper, carrying indicia 4.
- the inks which have been most used for mark-- ing photographic backing paper usually consist of a dye, a binder and a solvent, and are such as to have no effect on unexposed photographic emulsions with which they are in contact.
- the markings on the backing paper may reproduce themselves as an intensification of the latent image on the film. When the film is developed, the markings thus appear in the pictures.
- Photographic backing paper bearing indicia printed with an ink comprising a dye and approximately l%, calculated on the total solids in the ink, of a reducing agent selected from the group consisting of sodium sulfite, ferrous sulfate, sodium formaldehyde sulfoxylate and sodium hydrosulfite.
- a reducing agent selected from the group consisting of sodium sulfite, ferrous sulfate, sodium formaldehyde sulfoxylate and sodium hydrosulfite.
- Photographic backing paper bearing indicia printed with an ink comprising a dye and approximately 1%, calculated on the total solids in the ink, of sodium sulfite.
- a roll film cartridge comprising inter-rolled strips of film carrying a photographic emulsion and of backing paper, that surface of the backing paper which is in contact with the photographic emulsion carrying indicia printed with an ink comprising a dye and approximately 1%. calculated on the total solids in the ink, of a reducing agent selected from the group consisting of sodium sulfite, ferrous sulfate, sodium formalde hyde sulfoxylate and sodium hydrosulfite.
- a roll film cartridge comprising inter-rolled strips of film carrying a photographic emulsion and of backing paper, that surface of the backing lated on the total solids in the ink, of sodium ERNEST L. BAIXTER.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Description
Nov. 18, 1941- E. L. BAXTER PHOTOGRAPHIC BACKING PAPER Filed Nov.- 2, '1940 wank? IN V EN TOR W A TTORNEYS Patented Nov. 18, 1941 PHOTOGRAPHIC BACKING PAPER Ernest L. Baxter, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application November 2, 1940, Serial No. 364,061
4 Claims.
This invention relatesto photographic backing paper, and more particularly to the ink with which photographic backing paper is marked.
As is well known in the art, it is customary to roll up photographic roll film with a strip of backing paper, which is usually black on one side and colored on the other. This backing paper carries, on the colored side, markings or indicia which can be seen through the small window in the back of the camera, and indicate to the user the points at which winding should be stopped, and the serial numbers of the exposures. The markings are usually covered by a transparent overcoating on the paper. When the film is rolled up with the backing paper, the printed side of the paper is in contact with the emulsion side of the film.
The accompanying drawing shows a section of two convolutions of film with an interposed layer of backing paper, as it occurs in a roll film cartridge. I, I represents the film base, carrying the emulsion 2, 2. 3 represents the backing paper, carrying indicia 4.
The inks which have been most used for mark-- ing photographic backing paper usually consist of a dye, a binder and a solvent, and are such as to have no effect on unexposed photographic emulsions with which they are in contact. However, if a considerable period of time fel'apses between the exposure of a portion of the film and its development, so that the backing paper remains in contact with an emulsion containing a latent image, the markings on the backing paper may reproduce themselves as an intensification of the latent image on the film. When the film is developed, the markings thus appear in the pictures.
I have discovered that intensification of the latent image on a photographic film by the markings on the backing paper may be prevented byv incorporating certain reducing agents in the ink used for marking the backing paper. I have tested a very considerable number of reducing agents for this purpose, I have found only a few which are operative. These are: sodium sulfite, ferrous sulfate, sodium formaldehyde sulfoxylate, and sodium hydrosulfite. I prefer to use sodium sulfite because it oxidizes to sodium sulfate, which is normally found as a loading agent in all dyes and hence does not introduce a foreign substance into the ink.
While I have found that an amount of sodium sulfite equal to about 1% of the total solids in the ink is effective for preventing intensification of the latent image by the ink. 0.5% has been found to be ineffective, and 2% has been found to destroy the latent image. 1% of sodium sulfite, based on the total solids in the ink, has been found to have no action on unexposed film even under tropical storage conditions.
By way of illustration, by which I am not to be limited, I give the following example of an ink for marking photographic backing paper according to my invention.
2% of Nigrosine 2011 Gone. is dissolved in a 4% aqueous gelatin solution to form an ink. To 25 /2 lbs. of this ink is added 7 grams of sodium sulfite dissolved in 100 cc. of hot water.
What I claim as'my invention and desire to be secured by Letters Patent of the United States is:
1. Photographic backing paper bearing indicia printed with an ink comprising a dye and approximately l%, calculated on the total solids in the ink, of a reducing agent selected from the group consisting of sodium sulfite, ferrous sulfate, sodium formaldehyde sulfoxylate and sodium hydrosulfite.
2. Photographic backing paper bearing indicia printed with an ink comprising a dye and approximately 1%, calculated on the total solids in the ink, of sodium sulfite.
3. A roll film cartridge comprising inter-rolled strips of film carrying a photographic emulsion and of backing paper, that surface of the backing paper which is in contact with the photographic emulsion carrying indicia printed with an ink comprising a dye and approximately 1%. calculated on the total solids in the ink, of a reducing agent selected from the group consisting of sodium sulfite, ferrous sulfate, sodium formalde hyde sulfoxylate and sodium hydrosulfite.
4. A roll film cartridge comprising inter-rolled strips of film carrying a photographic emulsion and of backing paper, that surface of the backing lated on the total solids in the ink, of sodium ERNEST L. BAIXTER.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR956691D FR956691A (en) | 1940-11-02 | ||
US364061A US2262986A (en) | 1940-11-02 | 1940-11-02 | Photographic backing paper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US364061A US2262986A (en) | 1940-11-02 | 1940-11-02 | Photographic backing paper |
Publications (1)
Publication Number | Publication Date |
---|---|
US2262986A true US2262986A (en) | 1941-11-18 |
Family
ID=23432842
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US364061A Expired - Lifetime US2262986A (en) | 1940-11-02 | 1940-11-02 | Photographic backing paper |
Country Status (2)
Country | Link |
---|---|
US (1) | US2262986A (en) |
FR (1) | FR956691A (en) |
-
0
- FR FR956691D patent/FR956691A/fr not_active Expired
-
1940
- 1940-11-02 US US364061A patent/US2262986A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR956691A (en) | 1950-02-02 |
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