GB287542A - Improved reversal process for developing photographic silver-sensitised films - Google Patents

Improved reversal process for developing photographic silver-sensitised films

Info

Publication number
GB287542A
GB287542A GB1435/28A GB143528A GB287542A GB 287542 A GB287542 A GB 287542A GB 1435/28 A GB1435/28 A GB 1435/28A GB 143528 A GB143528 A GB 143528A GB 287542 A GB287542 A GB 287542A
Authority
GB
United Kingdom
Prior art keywords
reducing
developing
film
image
films
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
GB1435/28A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Publication of GB287542A publication Critical patent/GB287542A/en
Expired legal-status Critical Current

Links

Abstract

287,542. I. G. Farbenindustrie Akt.- Ges. March 25, 1927, [Convention date]. Developing, reversing, and reducing.-A process of developing photographic silver-sensitized films in order to produce thereon by reversal positives exhibiting the correct gradation consists (1) in subjecting the film after exposure to an abbreviated development not exceeding a duration fixed for the particular film-material, (2) reversing the image in known manner by dissolving out the silver image, treating the film in a clearing bath, exposing to light and re-developing, and (3) reducing the density of the resulting positive image by means of a reducing bath having a uniform action, prepared for example by mixing in stated proportions a solution of iodine in aqueous potassium iodide and an aqueous solution of thiocarbamide. This reducing bath may also be used for dissolving out the silver image produced by the first development.
GB1435/28A 1927-03-25 1928-01-16 Improved reversal process for developing photographic silver-sensitised films Expired GB287542A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE287542X 1927-03-25

Publications (1)

Publication Number Publication Date
GB287542A true GB287542A (en) 1929-01-24

Family

ID=6059334

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1435/28A Expired GB287542A (en) 1927-03-25 1928-01-16 Improved reversal process for developing photographic silver-sensitised films

Country Status (1)

Country Link
GB (1) GB287542A (en)

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