We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
Oci . 1947 DEEP-TANK COLOR PROCESSING 309
be immersed in the toning solution since the treatment has little effect on the previously applied dye-mordanted image on the opposite side of the film. Therefore, the film at this stage of the process consists of an orange-red dye-morda"nted image on one side of the film and a Prussian-blue image on the opposite side of the film.
After suitable washing, the film may be fixed and hardened as described by Miller7 and Cory8 in order to render the images more transparent and suitable for projection. Final washing and drying complete the process.
In recent years, several processes have been patented which are designed to improve the transparency and definition of the dye-mordanted and toned images, extend the uses of duplitized film to threecolor processes, and improve the color rendition of two-color processes by the better choice of colorants for the two records. In general the chemistry of these improvements will not alter the basic requirements for the process herein outlined.
It can be seen that the processing of duplitized film to yield twocolor pictures could be made a relatively rapid and easily controlled system if some method could be devised to eliminate the flotation or mechanical application step and treat the film in conventional deeptank processing machines. This has been done by applying to one side of the duplitized film a protective coating which is impervious to the treating solutions and which can be removed easily without altering the characteristics of the treatment applied to the unprotected side of the film. The idea of Using ' 'resists' ' for various types of photographic processing is not new having been described by many inventors including Kelley,2 Shorrocks,11 Mannes and Godowsky,12 and Lierg.13 Using a protective coating which is impervious to an iodizing solution, the following scheme could be used to process duplitized film by total immersion of the film in the processing solutions at every stage of the process.
It can be seen that the rate of film movement through the process is limited only by the usual limitations of a continuous processing machine with a multiplicity of tanks. Control of the iodizing step is simplified since the solution may be vigorously agitated with no danger of accidental treatment of the opposite side of the film.
The key to this process is the protective coating applied to one side of the duplitized film. Several types of -protective ' coatings1 were considered. Tests were made on materials removable from the film by treatment in solutions of strong acids. It ds evident -4hat