US530965A - Albrecht schmidt - Google Patents
Albrecht schmidt Download PDFInfo
- Publication number
- US530965A US530965A US530965DA US530965A US 530965 A US530965 A US 530965A US 530965D A US530965D A US 530965DA US 530965 A US530965 A US 530965A
- Authority
- US
- United States
- Prior art keywords
- persulphate
- fixing agent
- sodium
- albrecht
- schmidt
- 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
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G03C5/268—Processing baths not provided for elsewhere, e.g. pre-treatment, stop, intermediate or rinse baths
Definitions
- ALBRECHT SCHMIDT OF BERLIN, GERMANY.
- My invention relates to the removal of the fixing agent-for instance of the hyposul phite of sodium-by treating the fixed pictures with persulphates.
- the solution must not be too much concentrated in order to avoid an oxidation of the silver.
- the solutions may also be made slightly alkaline. The efiect of slightly acid solutions is not so favorable.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
UNITED STATES PATENT OFFICE.
ALBRECHT SCHMIDT, OF BERLIN, GERMANY.
HYPOFELIMINATOR.
SPECIFICATION forming part of Letters Patent No. 530,965, dated December 18, 1894. Arrliwtion fileflJuly .189 Serial No. 516,995. (No specimens.)
To all whom it may concern:
Be it known that I, ALBRECHT SCHMIDT, a subject of the King of Prussia, residing at 170 and 171 Mullerstrasse, Berlin, Prussia, Germany, have invented certain new and useful Improvements in and Relating to the Removal of the Fixing Agent from Photo graphic Pictures; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
My invention relates to the removal of the fixing agent-for instance of the hyposul phite of sodium-by treating the fixed pictures with persulphates.
Complaints are constantly heard of incomplete elutriation of the sodium fixing agent from photographic pictures and consequent discoloration of the photographs. Chloride of lime and eau de javelle which have been repeatedly recommended for destroying the last traces of the fixing agent, hyposulphite of sodium, and consequently shortening the elutriation process, have only been attended with slight success on account of their extremely inconstant composition. They have also other drawbacks.
Now I have found that the salts of persulphuric acid are excellently adapted for rendering an excess of hyposulphite harmless by oxidation. After the photograph has been fixed, the plate or paper is immersed in a dilute solutionof persulphate of potassium or of persulphate of ammonium or of persulphate of sodium. The formula of such a persulphate is represented by B 8 0 In this formula R stands for the radical, which may be potassium, sodium or ammonium. While otherwise it is necessary to wash for hours before the wash water no longer gives a yellow'precipitate with silver nitrate, the employment 0f persulphate effects the removal of all fixing agent in a far shorter time, and the subsequent discoloration of the plate is prevented.
Properly a one percent. solution of persulphate may be employed.
The solution must not be too much concentrated in order to avoid an oxidation of the silver. The solutions may also be made slightly alkaline. The efiect of slightly acid solutions is not so favorable.
Having thus described my invention and in what manner it is to be carried out, what I claim as new, and desire to secure by Letters Patent, is-
In the art of photography the improvement which consists in removing the fixing agent from photographic pictures by treating them
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US530965A true US530965A (en) | 1894-12-18 |
Family
ID=2599744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US530965D Expired - Lifetime US530965A (en) | Albrecht schmidt |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US530965A (en) |
-
0
- US US530965D patent/US530965A/en not_active Expired - Lifetime
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