DE437598C - Inverse process for making direct positives in photographic recordings - Google Patents

Inverse process for making direct positives in photographic recordings

Info

Publication number
DE437598C
DE437598C DEW65616D DEW0065616D DE437598C DE 437598 C DE437598 C DE 437598C DE W65616 D DEW65616 D DE W65616D DE W0065616 D DEW0065616 D DE W0065616D DE 437598 C DE437598 C DE 437598C
Authority
DE
Germany
Prior art keywords
making direct
photographic recordings
inverse process
direct positives
positives
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
Application number
DEW65616D
Other languages
German (de)
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.)
ICA AKT GES
Original Assignee
ICA AKT GES
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 ICA AKT GES filed Critical ICA AKT GES
Priority to DEW65616D priority Critical patent/DE437598C/en
Application granted granted Critical
Publication of DE437598C publication Critical patent/DE437598C/en
Expired 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
    • G03C5/50—Reversal development; Contact processes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Description

Umkehrverfahren zur Herstellung direkter Positive bei photographischen Aufnahmen. Die Erfindung betrifft ein photographisches Umkehrverfahren von Negativ in Positiv oder umgekehrt. Es sind bereits Umkehrverfahren bekannt, bei denen z. B. das schwarz:.. Silberkorn zunächst in eine Uranverbindung verwandelt und bei dem zweiten Entwickeln aufgelöst wird, indem infolge des Alkaligehaltes im Hervorrufer das negative Uranbild allmählich verschwindet.Inverse process for making direct positives in photographic applications Recordings. The invention relates to a reversal photographic process of negative in positive or vice versa. There are already reversal processes known in which z. B. the black: .. silver grain first transformed into a uranium compound and at the second development is dissolved, as a result of the alkali content in the evoker the negative uranium image gradually disappears.

Dieses Verfahren hat aber den Nachteil des hohen Preises von Uranverbindungen und der großen Giftigkeit. Erfindungsgemäß wird eine Mischung von Bleinitrat und rotem Blutlaugensalz als Bleichlösung für das negative Bild benutzt.However, this process has the disadvantage of the high price of uranium compounds and great toxicity. According to the invention, a mixture of lead nitrate and red blood liquor salt was used as a bleach solution for the negative image.

Als Erfindungsbeispiel soll folgendes Verfahren beschrieben werden.The following method will be described as an example of the invention.

Die entwickelte Platte wird in einem Gemisch von Bleinitrat und rotem Blutlaugensalz behandelt, wobei das metallische Silber in einen hellen Niederschlag übergeführt wird. Daraufhin wird die Platte bzw. das Papier nochmals belichtet und nochmals entwickelt, was getrennt voneinander oder gleichzeitig geschehen kann. Dabei wird nun das freiliegende Halogensilber entwickelt, nicht aber die Verbindung, in die das Silber nach der Erstentwicklung übergeführt wurde. Dieser Niederschlag wird bei der nachfolgenden Entwicklung nicht angegriffen und schützt als optische Decke sowie auch mechanisch das unter ihm befindliche Halogensilber vor der Schwärzung durch die zweite Entwicklung. Durch dieses Verfahren wird die Möglichkeit geschaffen, sowohl Strich- als auch Halbtonbilder auf die einfachste Weise aus einem Negativ in ein Positiv überzuführen. Die nach der zweiten Entwicklung noch zurückgebliebene Schicht, die zum Teil aus Blei-, zum Teil aus Silberverbindungen besteht, wird in gewöhnlicher Weise im Fixieri>ad behandelt. Das Verfahren kann sowohl auf Papier- wie auf Glas- oder Filmbilder, und zwar sowohl für Strich- als auch Halbtonaufnahmen verwendet werden.The developed plate is in a mixture of lead nitrate and red Blood liquor salt treated, leaving the metallic silver in a bright precipitate is convicted. The plate or the paper is then exposed again and redeveloped what can happen separately or at the same time. The exposed halogen silver is now developed, but not the connection into which the silver was transferred after the initial development. This precipitate is not attacked during the subsequent development and protects as an optical one Cover as well as mechanically the halogen silver under it before blackening by the second development. This procedure creates the possibility of both line and halftone images in the simplest possible way from a negative to be converted into a positive. The one that was left behind after the second development Layer, which consists partly of lead and partly of silver compounds, is in usually dealt with in the Fixieri> ad. The process can be carried out on paper like on glass or film images, both for line and halftone recordings be used.

Claims (1)

PATENTANSPRÜCHE: i. Umkehrverfahren zur Herstellung direkter Positive bei photographischen Aufnahmen, dadurch gekennzeichnet, daß das entwickelte Silberkorn mit einem Gemisch von Bleinitrat und rotem Blutlaugensalz behandelt wird. Umkehrverfahren zur Herstellung direkter Positive bei photographischen Aufnahmen nach Anspruch i, dadurch gekennzeichnet, daß die zweite Belichtung vor der zweiten Entwicklung erfolgt.PATENT CLAIMS: i. Reversal process for making direct positives in photographic recordings, characterized in that the developed silver grain treated with a mixture of lead nitrate and red blood liquor salt. Reverse procedure for the production of direct positives in photographic recordings according to claim i, characterized in that the second exposure takes place before the second development.
DEW65616D 1924-02-25 1924-02-26 Inverse process for making direct positives in photographic recordings Expired DE437598C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEW65616D DE437598C (en) 1924-02-25 1924-02-26 Inverse process for making direct positives in photographic recordings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEW0065616 1924-02-25
DEW65616D DE437598C (en) 1924-02-25 1924-02-26 Inverse process for making direct positives in photographic recordings

Publications (1)

Publication Number Publication Date
DE437598C true DE437598C (en) 1926-11-23

Family

ID=26003031

Family Applications (1)

Application Number Title Priority Date Filing Date
DEW65616D Expired DE437598C (en) 1924-02-25 1924-02-26 Inverse process for making direct positives in photographic recordings

Country Status (1)

Country Link
DE (1) DE437598C (en)

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