DE346851C - Method of reducing the sensitivity of halide silver emulsions - Google Patents
Method of reducing the sensitivity of halide silver emulsionsInfo
- Publication number
- DE346851C DE346851C DE1920346851D DE346851DD DE346851C DE 346851 C DE346851 C DE 346851C DE 1920346851 D DE1920346851 D DE 1920346851D DE 346851D D DE346851D D DE 346851DD DE 346851 C DE346851 C DE 346851C
- Authority
- DE
- Germany
- Prior art keywords
- sensitivity
- reducing
- sulfur
- silver emulsions
- halide silver
- 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
Links
Landscapes
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
Verfahren, die Empfindlichkeit von Halogensilberemulsionen herabzusetzen. Es wurde gefunden, daß die Empfindlichkeit einer Halogensilberemälsion ganz erheblich (bis auf etwa 1,/20,) der ursprünglichen Empfindlichkeit) herabgesetzt werden kanxl, Wenn der Emulsion Schwefel in verteiltem Zustande bzw. andere Elemente der Schwefelgruppe zugesetzt werden.Method of reducing the sensitivity of halide silver emulsions. It has been found that the sensitivity of a silver halide painting is quite significant (down to about 1/20 of the original sensitivity) can be reduced, If the emulsion contains sulfur in a dispersed state or other elements of the sulfur group can be added.
Von den bisher zur Empfindlichkeitsherabsetzung angewandten Mitteln weicht der vorliegende Zusatz in besonders vorteilhafter Weise dadurch ab, daß er ein in Wasser nahezu unlöslicher Körper ist und daher nicht nachwirkt.Of the means previously used to reduce sensitivity differs from the present addition in a particularly advantageous manner in that it is a body that is almost insoluble in water and therefore has no after-effects.
Bei obigen genannten Mitteln ist vermutlich deswegen die Gefahr der Bildung von Schleiern, insbesondere bei einer größeren Menge des Zusatzes, groß. Schwefel kann dagegen in größten Mengen zugesetzt werden, ohne Schleier zu erzeugen, unter Umständen wird sogar ein vorhandener Schleier verringert oder beseitigt. Dies Verhalten ist um so überraschender, als Schwefel in den meisten Verbindungen auf Halogensilberemulsionen verschleiernd wirkt.With the above mentioned means there is probably the risk of Formation of veils, especially with a larger amount of the additive, is great. Sulfur, on the other hand, can be added in large quantities without creating a fog, under certain circumstances an existing veil is even reduced or eliminated. this Behavior is all the more surprising as sulfur is present in most compounds Halide silver emulsions have a concealing effect.
Wie bereits erwähnt, haben die derselben Gruppe angehörenden Elemente Selen und Tellur die gleiche Wirkung.As mentioned earlier, they have elements belonging to the same group Selenium and tellurium have the same effect.
Die Anwendung des Schwefels kann erfolgen a) in fester Form. Schwefelblumen - werden einer fertigen Emulsion zugesetzt und innig hiermit durch Rühren vermengt. Nach einhalbstündigem Rühren ist die Empfindlichkeit entsprechend herabgesetzt.The sulfur can be used a) in solid form. Sulfur flowers - are added to a finished emulsion and intimately mixed with it by stirring. After stirring for half an hour, the sensitivity is correspondingly reduced.
b) in Form einer Emulsion Monopolbrillantöl wird mit Tetrachlorkohlenstoff zu einer Emulsion verrührt, darauf Schwefelbhunen eingetragen und fein verteilt: Die Schwefelemulsion wird der Halogensilberemulsion in entsprechender Menge zugesetzt und gut gerührt.b) in the form of an emulsion monopoly brilliant oil is made with carbon tetrachloride stirred into an emulsion, added sulfur beef and finely divided: The sulfur emulsion is added to the silver halide emulsion in the appropriate amount and well stirred.
Diese Anwendungsform hat den Vorteil einer raschen Verteilung des Schwefels in der Emulsion.This application form has the advantage of a rapid distribution of the Sulfur in the emulsion.
c) in Form einer Lösung, d) in Form einer kolloidalen Lösung.c) in the form of a solution, d) in the form of a colloidal solution.
Der Zusatz von. Schwefel zu Gäslichtemulsionen hat außerdem den Vorteil, daß die Emulsionen leichter bei der Entwicklung braune Töne annehmen.The addition of. Sulfur to gas emulsions also has the advantage of that the emulsions take on brown tones more easily during development.
Der Zusatz ermöglicht ferner eine längere Entwicklungsdauer.The addition also enables a longer development time.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE346851T | 1920-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE346851C true DE346851C (en) | 1922-01-07 |
Family
ID=6255584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1920346851D Expired DE346851C (en) | 1920-10-26 | 1920-10-26 | Method of reducing the sensitivity of halide silver emulsions |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE346851C (en) |
-
1920
- 1920-10-26 DE DE1920346851D patent/DE346851C/en not_active Expired
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