US2118877A - Mordant dye image and process of producing the same - Google Patents

Mordant dye image and process of producing the same Download PDF

Info

Publication number
US2118877A
US2118877A US86698A US8669836A US2118877A US 2118877 A US2118877 A US 2118877A US 86698 A US86698 A US 86698A US 8669836 A US8669836 A US 8669836A US 2118877 A US2118877 A US 2118877A
Authority
US
United States
Prior art keywords
silver
mordant
image
producing
dye image
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
US86698A
Inventor
Arx Rudolf Von
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2118877A publication Critical patent/US2118877A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/40—Chemically transforming developed images
    • G03C5/48—Mordanting

Definitions

  • the Christensen'process in which the active mordant is represented by cuprous thiocyanate, may be mentioned here.
  • the active mordant compound in question here is theferrocyanide of zinc.
  • the converting bath may easily be prepared in such a manner that the converting reaction practically stops, leaving an image consisting of unattacked silver, ferrocyanide of silver and ferrocyanide of zinc.
  • Pure color tones such as they are required, say, for purposes of color photography, can -.be obtained either by using a converting bath leaving no unattacked silver, or, again, by removing the silver residues, either before or after the dyeing process, by some agent capable of dissolving silver (for instance: diluted chromic acid).
  • the ferrocyanideof silver, too, formed simultaneously with the ferrocyanide of zinc, can be easily removed, for instance with the aid of thio-.
  • the dyeing is done in a solution of malachite greenhaving thiscompositionz- 1 gm. of malachite green, 2 gms. of glacial acetic acid, 3000 cm; of water.
  • the resulting mordant-dye image is. given a brief wash in water for the purpose of .removing from it any unmordanted coloring matter and may be allowed to remain in this condition, or, again, be desilvered by means of diluted chromic acid.
  • the desilvering can, if desired, be done prior to the dyeing process.
  • the ferrocyanide of silver is readily dissolved away with thiosulphate.
  • the process of producing a mordant color image which comprises treating a photographic silver image with an aqueous solution contain ing a soluble zinc salt, a soluble ferricyanide, and a neutral salt of a strong base and a weak organic acid the anion of which is capable of forming with the zinc ion in the presence of hydroxyl ions 9.
  • the process of producing a mordant color image which comprises treating a photographic silver image with an aqueous solution containing zinc sulphate, potassium ferricyanide and potassium citrate, the dilution of the solution being adapted to bring the conversion of no more than a part of the silver of the silver image into zinc ferrocyanide and silver ferrocyanide, and then converting the mordant image into a mordant dye image by treating it with an aqueous dyestufl solution.
  • 3. The process of producing a mordant color image which consists in treating a photographic silver image for a few minutes in a bath containing 1.6 gms. of zinc sulphate, 16 gms. of neutral potassium citrate and 1.6 gms. of potassium ierricyanide per litre of water, and then converting the image into a mordant dye image by treating it with an aqueous dyestuff solution.

Description

Patented May 31, 1938 UNITED STATES PATENT OFFICE MOBDANT DYE MAGE AND PROCESS OF PBODUC'IIN G THE SAME I Rudolf yon Arx, Berlln-Wilmersdorr, Germany 5 Claims. (Cl. 95-88) My invention relates to theproduction of colored images, more particularly to the production of mordant dye images.
Several processes are.known by which photographic silver images can be transformed, by the medium of mordant images, intodyestufi images. These are what are termed mordant-dye processes.
By way of example, the Christensen'process, in which the active mordant is represented by cuprous thiocyanate, may be mentioned here.
Now it is the object of this invention to make known a process which, from its many-sidedness, is most specially suited for actual practice. The process is characterized by a maximum of insensibility (freedom from stains) and reliability. The disadvantage inherent to manyother mar;- dant-dye processes due to the fact that silver images of a character frequently of very particularly diflicult access are required as a base, is done away with here.
The active mordant compound in question here is theferrocyanide of zinc.
The converting bath may easily be prepared in such a manner that the converting reaction practically stops, leaving an image consisting of unattacked silver, ferrocyanide of silver and ferrocyanide of zinc. By this means, after the dyeing, mordant-dye images are obtained showing color tones of a pleasing effect due to residual silver.
Pure color tones, such as they are required, say, for purposes of color photography, can -.be obtained either by using a converting bath leaving no unattacked silver, or, again, by removing the silver residues, either before or after the dyeing process, by some agent capable of dissolving silver (for instance: diluted chromic acid). I
The ferrocyanideof silver, too, formed simultaneously with the ferrocyanide of zinc, can be easily removed, for instance with the aid of thio-.
After a short wash, the dyeing is done in a solution of malachite greenhaving thiscompositionz- 1 gm. of malachite green, 2 gms. of glacial acetic acid, 3000 cm; of water. The resulting mordant-dye image is. given a brief wash in water for the purpose of .removing from it any unmordanted coloring matter and may be allowed to remain in this condition, or, again, be desilvered by means of diluted chromic acid.
The desilvering can, if desired, be done prior to the dyeing process.
The ferrocyanide of silver is readily dissolved away with thiosulphate.
What I claim as my invention and desire to secure by Letters Patent of the United States is:
1. The process of producing a mordant color image which comprises treating a photographic silver image with an aqueous solution contain ing a soluble zinc salt, a soluble ferricyanide, and a neutral salt of a strong base and a weak organic acid the anion of which is capable of forming with the zinc ion in the presence of hydroxyl ions 9. complex zinc-organic acid anion, thereby preventing the precipitation of zinc ferricyanide, the dilution of said aqueous solution being adapted to bring the reaction to a standstill in a short time with the conversion of no more than a part of the sliver of the silver image into zinc ferrocyanide and silver ferrocyanide, and then converting the image into a mordant dye image by treating it with an aqueous dyestufl solution.
2. The process of producing a mordant color image which comprises treating a photographic silver image with an aqueous solution containing zinc sulphate, potassium ferricyanide and potassium citrate, the dilution of the solution being adapted to bring the conversion of no more than a part of the silver of the silver image into zinc ferrocyanide and silver ferrocyanide, and then converting the mordant image into a mordant dye image by treating it with an aqueous dyestufl solution. 3. The process of producing a mordant color image which consists in treating a photographic silver image for a few minutes in a bath containing 1.6 gms. of zinc sulphate, 16 gms. of neutral potassium citrate and 1.6 gms. of potassium ierricyanide per litre of water, and then converting the image into a mordant dye image by treating it with an aqueous dyestuff solution.
4. In the process claimed in claim-'1 the step of dissolving unattacked silver out of the mordant image prior to converting the. latter to a Y mordant dye image.
5. In the process claimed in claim 1 the step of dissolving unattacked silver outof the mardant dye-image.
'BUDOLF von ARK.
US86698A 1935-06-28 1936-06-22 Mordant dye image and process of producing the same Expired - Lifetime US2118877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA0076403 1935-06-28

Publications (1)

Publication Number Publication Date
US2118877A true US2118877A (en) 1938-05-31

Family

ID=6946775

Family Applications (1)

Application Number Title Priority Date Filing Date
US86698A Expired - Lifetime US2118877A (en) 1935-06-28 1936-06-22 Mordant dye image and process of producing the same

Country Status (2)

Country Link
US (1) US2118877A (en)
FR (1) FR807726A (en)

Also Published As

Publication number Publication date
FR807726A (en) 1937-01-20

Similar Documents

Publication Publication Date Title
GB498663A (en) Improvements in processes for the production of dye images from photographic silver salt images
US2118877A (en) Mordant dye image and process of producing the same
US2913338A (en) Prevention of cyan dye fading in color developed prints and films
US2171609A (en) Toning photographic prints
US2231201A (en) Toning photographic prints
US3259497A (en) Photographic color reversal process
US2183661A (en) Process of coloring photographic images
US1059917A (en) Process of photography in colors.
DE2101344A1 (en) Process for the production of color copy material
US2341079A (en) Color photography
US2312874A (en) Color photography
DE617713C (en) Process for the production of color images
US1473568A (en) Process of converting silver prints into color prints
US2093421A (en) Method of making photoprints and developer therefor
DE561867C (en) Process for the production of dye images for single and multicolor photography and cinematography
DE593839C (en) Process for the treatment of silver images, in particular reversal images
US2218001A (en) Process for making colored prints
DE358093C (en) Process for the production of photographic reliefs
US2295107A (en) Method of making colored photographs
DE811175C (en) Process for the production of silver-containing layers on aluminum and its alloys
GB298979A (en) Process of producing pictures consisting of dyes in photographic manner
GB751186A (en) Improvements in processes of colour photography and compositions therefor
US2182672A (en) Method of restoring inked documents
DE895246C (en) Process for the production of photographic positive images by the reflex copying process
DE946327C (en) Process for improving the whiteness of photographic images produced by the silver salt diffusion process