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
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/3046—Processing baths not provided for elsewhere, e.g. final or intermediate washings

Definitions

• photographic dyesfdinge condition ojtenigizesults inn the loss of yellow or other color d'yes; This condi tion is caused by h-i'glttemperature and high humidity; For instance; the storins of colored photographs anattic or evemi-n email-let often produces this-undesirable color*deterioration; It has been determinedthat color prints, pertieue leu'ly the whites, wills-tam" s-filirown' be'oaus or oxidation oftheco1ordeveloping? agent retainell in the subbing layer.
• An object of my-mventlorr lseto provide a noyel method of treating colored photographssm thistxtremehumiditycomlitibns do-mot' dsttomfirifi inalcoloration; u
• N'; Nv dimethylhnee NT-inethy'luneaj NjN' climethxlnreai.
• the tollowlng compounds; are: illustrative oi; reaction: nzeoduetsv of' formaldehyde: with; uneas which; maybe;- employed; as; stain; inhibltoitsz;
• Multicolonu-photographic materials which are color developedby azine developers, i. e., aromatic triamines, .to yield azine (phenazonium) dye 'imagesarddes'cribed in United States Patent Mul ticblor photographic materials in which the final dye images are azo dye images are preparedaccording ,to the procedural steps disclosed in United-States Patents 1,985,344 and 2,020,775.
• azine developers i. e., aromatic triamines
• the color reversible film consists of an integral tripack emulsioncoated on the usual clear cellulose acetate or nitrate film base.
• Each of the emulsions is sensitized to one of the primary 'colorsbf light, namely blue, green, and red.
• the top layer is-blue sensitive. yellow in color and blue absorbing, lies under the top layer.
• Example I A 2%" x2% color transparency was printed by' projection on two3"x'5" sheets of color reversible whiteopaque' film having gelatin layers on both sides of the film base.
• one print was allowed to dry while the other was rinsed for 3 minutes in an aqueous solution consisting of 98 parts by weight of water and 2 parts by weight of N,N'- dimethylolurea and the print allowed to dry.
• Both prints i. e., the treated and untreated, were exposed to high humidity oven conditions for 5 hours. During that time, the relative humidity in the oven ranged progressively from 56 to 100% at a temperature ranging from 40 to 60 C. The prints were removed from the oven and allowed to reach room temperature. It was observed that a very slight yellowing appeared on the treated color print. The color balance of the untreated color print, however, was completely ruined by a yellow stain appearing overall while at the same time the densities of the original yellow image were lowered. It was also noted that the backs of the treated prints were free of a yellow-brown stain which had appeared on the untreated sample.
• Example II Example I was repeated with the exception that the high humidity oven test was replaced by a storage test. Both prints, i. e., the treated and untreated, were stored in an ordinary filing cabinet for over 8 months. Upon inspection, it was noted that the untreated print had stained This brownyellow stain was very noticeable on the back of the untreated print. The images on the treated print had not yellowed nor had the back stained a yellow-brown stain which was so noticeable on the untreated print.
• Example III Example III was repeated with the exception that the colored material employed was a color paper and the final rinse bath was a 2% solution of the reaction product of N-ethylurea and formaldehyde (N-methylolmethylenebismonoethylurea) instead of a 2% solution of N,N'-dimethyl-
• Example IV Example I was repeated with the exception 6 that the final rinse bath was a 3% solution of the reaction product of N,N-dimethylurea and formaldehyde (N'-methylol-N,N-dimethylurea) instead of a 2% solution of N,N'-dimethylolurea.
• the untreated film after being subjected to the high humidity oven test, showed an overall yellow stain and as a result the color balance was completely ruined, whereas the treated film showed no staining whatsoever.
• R N I O C/ e wherein R, R1, and R2 each represent a member selected from the class consisting of hydrogen and lower alkyl, and wherein R2 is always hydrogen whenboth R and R1 are lower alkyl.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (4)

Cited By (6)

• 0
  • BE BE502481D patent/BE502481A/xx unknown
• 1950
  • 1950-04-12 US US155557A patent/US2579435A/en not_active Expired - Lifetime
• 1951
  • 1951-04-10 FR FR1035273D patent/FR1035273A/fr not_active Expired
  • 1951-04-12 CH CH292827D patent/CH292827A/fr unknown

Non-Patent Citations (1)

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