US1850162A - Fixing bleaching-out pictures - Google Patents

Fixing bleaching-out pictures Download PDF

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Publication number
US1850162A
US1850162A US447420A US44742030A US1850162A US 1850162 A US1850162 A US 1850162A US 447420 A US447420 A US 447420A US 44742030 A US44742030 A US 44742030A US 1850162 A US1850162 A US 1850162A
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US
United States
Prior art keywords
bleaching
sensitizer
fixing
fixing bleaching
out pictures
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
Application number
US447420A
Inventor
Wendt Bruno
Bincer Hans
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GAF Chemicals Corp
Original Assignee
Agfa Ansco Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agfa Ansco Corp filed Critical Agfa Ansco Corp
Application granted granted Critical
Publication of US1850162A publication Critical patent/US1850162A/en
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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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/02—Direct bleach-out processes; Materials therefor; Preparing or processing such materials

Definitions

  • Our present invention relates to a process 5 dimin shed by removing the sensitizer from the picture. This operation has, however,
  • sulfurous acid for fixing such bleaching-out layers sulfurous acid is used with good result. It acts upon the derivative of thiourea serving as sensitizer without'exerting any injurious influence on the dye.
  • the sulfurous acid may be used either in aqueous solution or dissolved in an organic solvent.
  • the solvent selected for this purpose must be one which does not act upon the binding agent in the layer to be fixed in each of bleaching out dyes constituting the picture a mechanical way or by means of an indifferent liquid, for instance, benzene.
  • the invention is not limited to the foregoing example or to the specific details given therein.
  • a solution of sulfurous acid in a suitable solvent evolving gaseous sulfur dioxide may be used.
  • the unfixed icture may be treated in a bath containing in the case of nitrocellulose used as a binding agent for the dye a mixture of benezene and methyl alcoholin the ratio 4: 1 and sulfurous acid in a quantity up to saturation.
  • the fixing process is finished in about 20 minutes.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Adhesive Tapes (AREA)
  • Detergent Compositions (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

Patented Mar. 22, 1932 UNITED STATES PATENT- OFFICE BRUNO WENDT, OF DESSAU IN ANHALT, AND HANS BINCER, F DE SSAU-ZIEBIGK 1N ANHAL'I', GERMANY, ASSIGNORS TO AGFA ANSGO CORPORATION, OF BINGHAMTON, NEW YORK, A CORPORATION OF NEW YORK rrxme BLEAcHme-oUr PICTURES.
No Drawing. Application filed April 25, 1930, Serial No. 447,420, and in Germany May 11, 1929.
Our present invention relates to a process 5 dimin shed by removing the sensitizer from the picture. This operation has, however,
. been difiicult since the solvents for the sensitizer also attack the dyes constituting thepicture. 0
According to this invention, for fixing such bleaching-out layers sulfurous acid is used with good result. It acts upon the derivative of thiourea serving as sensitizer without'exerting any injurious influence on the dye.
The sulfurous acid may be used either in aqueous solution or dissolved in an organic solvent. The solvent selected for this purpose must be one which does not act upon the binding agent in the layer to be fixed in each of bleaching out dyes constituting the picture a mechanical way or by means of an indifferent liquid, for instance, benzene.
The following example serves to illustrate the invention:
about 3 hours in a closed vessel on the bottom of which there is a dish charged with an aqueous solution of sodium bisulfite. On the layer a decomposition product of the sensitizer, which is of unknown constitution segregates in the form of oily drops which are removed by means of a piece of'fabric moistened with benzene.
The invention'is not limited to the foregoing example or to the specific details given therein. Thus, for instance, instead of an aqueous solution of sodium bisulfite a solution of sulfurous acid in a suitable solvent evolving gaseous sulfur dioxide may be used. Or, the unfixed icture may be treated in a bath containing in the case of nitrocellulose used as a binding agent for the dye a mixture of benezene and methyl alcoholin the ratio 4: 1 and sulfurous acid in a quantity up to saturation. Thus, the fixing process is finished in about 20 minutes.
In the same manner, other layers containa ing other sensitizers of the group comprising derivatives of thiourea, may be fixed.
What we claim is 1. The process of fixing bleaching-out layers containing a derivative of thiourea as a sensitizer, which comprises acting upon said layer which sulfurous acid.
2. The process of fixing bleaching-out layers containing a derivative of thiourea as a sensitizer, which comprises acting upon said layer with gaseous sulfur dioxide.
3. The process of fixing bleaching-out layers containing allylthiourea 'as a sensitizer, which comprises acting upon said layer with sulfurous acid.
4. The process of fixing bleaching-out layers containing allylthiourea as a sensitizer, whichcomprises acting upon said layer with gaseous sulfur dioxide.
In testimony whereof, we affix our signatures.
' BRUNO WENDT.
HANS BINCER.
A picture made by the bleaching-out process the binding agent of which consists of nitrocellulose and which contains diethylallylthiourea as a sensitizer, is placed for
US447420A 1929-05-11 1930-04-25 Fixing bleaching-out pictures Expired - Lifetime US1850162A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI0038035 1929-05-11

Publications (1)

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US1850162A true US1850162A (en) 1932-03-22

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ID=7189676

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US447420A Expired - Lifetime US1850162A (en) 1929-05-11 1930-04-25 Fixing bleaching-out pictures

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US (1) US1850162A (en)
FR (1) FR695364A (en)
GB (1) GB341371A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437412A (en) * 1944-11-08 1948-03-09 Eastman Kodak Co Latent image intensification with sulfur dioxide
US3285744A (en) * 1963-04-04 1966-11-15 Horizons Inc Photography
US3892569A (en) * 1972-12-04 1975-07-01 Gen Film Dev Corp Photosensitive sheets comprising organic dyes and sensitizers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2437412A (en) * 1944-11-08 1948-03-09 Eastman Kodak Co Latent image intensification with sulfur dioxide
US3285744A (en) * 1963-04-04 1966-11-15 Horizons Inc Photography
US3892569A (en) * 1972-12-04 1975-07-01 Gen Film Dev Corp Photosensitive sheets comprising organic dyes and sensitizers

Also Published As

Publication number Publication date
GB341371A (en) 1931-01-15
FR695364A (en) 1930-12-16

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