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
  • G03C1/00—Photosensitive materials
  • G03C1/52—Compositions containing diazo compounds as photosensitive substances
  • G03C1/62—Metal compounds reducible to metal
• • 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
  • G03C5/58—Processes for obtaining metallic images by vapour deposition or physical development

Definitions

• the invention relates to a method of producing contrasts, consisting of metal, in photographic materialby physical development of latent images in sensitized, lyophilicf supports, the term physical development being understood to mean a method of developing according to which, prior to' development, all the metal required for building up the contrast does not yet occupy itsposition inthe contrast as an ion or as a compound and the term latent image being understood to mean the image which is produced by mere exposure of. the photographic material before external measures are taken to intensify this image; in some cases the said image may already be visible.
• the invention has for its object to obviate these latter difficulties.
• 1yophilic photographic material in the form of a pile of sheets is developed in a stable physical slow-action developer which contains not more than approximately three times the'quantity of metal salt which just suflices for building up the contrasts.
• the sheets of photographic material may be introduced into the developing liquid one at a time and piled up therein, so that'- irom the start a layer of developing liquid is provided between each pair of consecutive sheets,
• suificiently rapid moistening of the sheets of paper may, however, be obtained by adding to the developer a given quantity of a diffusing agent and for this purpose use may be made with satisfactory result, for example, of the product delivered on sale by the Imperial Chemical Industries under the registered trademark of Lissapol-N,.
• the latter is a wetting agent or detergent which has been described in a paper entitled fWetting and Detergency issued in 1937 by the Chemical Society of London and is a polyether aswell as a monohydric alcohol having the probable chemical formula:
• the quantity required varies with the content of glue in the paper and is generally from some few tenths of a percent to some few percents in the developer.
• Other diffusing-agents are also suitable if they do not result in undue reactions with the developer or the chemicals in the photographic material.
• the aforesaid stabilized developers may be 'produced in various ways.
• 'A customary physical developer contains 1 'or 2% of metol or hydroquinone to which an organic acid, say citric acid or tartaric acid, is fad'ded to adjust the pH to approximately 2
• This solution provided with, for example, 0.5% of silver nitrate, developes,
• any rejirlainder of the pile may be subjected, without radiation, to the action of'the developer.
• Example II 25 sheets of heavily glued paper (size 9 x 12 cms.) were sensitized by immersion in the sensitizing solution referred to in Example I. Subse-- .quent to drying they were exposed, in contact with a photographic negative of a printed text, fore-3 seconds at a distance of 25 cms. from ahigh-pressure mercury-vapour discharge lamp of .500 w. a The sheets were then piled in a developing dish containing 125 cc. of dilute physical denight.
• Example III I V sheets of'basepaperfor phototype (80 'grs. persquare metre), 9x 12 aris -sensitized by twosided application, by rolling, of a'solution of 0.4 n hydroxy-l diazonium-2 methyl-6 benzene sulphonic acid-4, 0.4 n mercurous nitrate and 0.4 n .nitric. acid, were exposed on both sides in contact with a photographic negative of.
• Example IV 25 sheets of base 'paper for phototype, sensitized in the manner described in Example IIIand exposed, were jcombined to form apile" andithis pile wasimmersed, as a whole, in cc. of a strong-acid ,physicalfdevelopercontaining 1% of metol, 0.3 n" nitric' acid, 0.02% of 'silver nitrate, everything in water, and developed.
• the development of the pile was completed in about 15 minutes and the result was the same as mentioned in the preceding examples, eve'nwhen the pile was left tostand for a longer period in the developingliquid. When not used. this develop- .er remains'stab'lefor a' few hours. It may be regenerated by adding 2.5 cc.'of a solution of 1% silvernitrate in water.
• Example V 2 5-sheets of unglued paper were sensitized in the manner described in Example III dried and unilaterally exposed in the above-mentioned manner. They were combined to form a pile and the pile was immersed in a developer of the composition: 0.l% of metol, 0.2% of tartaric acid, 0.2% ofsilver nitrate, everything in water..
• the quantity of developer was 5 cc; per square dm. of paper to be developed.
• mple v1 25 sheets of paper, sensitized and exposed in the manner described in Example III were combined toform a pile and immersed-as such, in a developing tank containing 250 cc. of a developer of the following composition: 1% of hydroquinone, 4% of tartaric acid, 25% of glycerol, 0.02% of silver nitrate, everything in water.
• a method of producing photographic metal contrasts which comprises stacking a plurality of sheets of photographic material each of which ,,comprises a lyophilic support carrying-a lightsensitive system containing :a: diazonium compound rand.a-mercurous salt and which ,hasbeen .exposed to lightxto form aqlatentphotographic .contrast thereon ,in astable developing *liquid .-..containin a metal saltreducible to-a metal in solution anda compound capable of reducin the metal salt toa metal, said liquidcontaining a quantity or said .metal-salnwhichis insu-iiicient amount to completelyedevelop the said latent contrasts-in all the sheets but'which is less than three times said amount forta timesufi'icientsto completely develop thesaid latent-contrasts.
• a et od- :oi p ducin photo aph c metal @contrastswhi'ch comprisesstacking a-plurality of sheets ofphotographicmaterial each ofiwhich comprises a lyophilic support carryingazlightsensitive System containing a diazonium compound and-a mercurous 'salt and which has been exposedto light to form alatent photographic contrast therein,- and introducing a said stack of 7 sheets intoa stable developing liquid containing a metal salt reducible to 'ajmetal in solution, a compound capable-of reducing the metal salt to a metal, and a diitusing agent, said liquid containing a ouantity-ofsaid metalsalt which is in *suflicient-amount to completely develop the said latent contrast but less than three times the said amount for a time sufficient to completelydevelop the said contrasts.
• a method of producing photographic metal contrasts which comprises stacking a plurality of 7 sheets of photographic "material each ofwhich comprises a lyophilic-support carrying alightsensitive system containing *a diazonium compound and a; mercurous salt and which has been exposed to light to' forme latent photographic contrast thereonin a stablev developing "liquid containing a metal salt reducible to a, metal, in solutionand a compound capable of reducing the metal salt to a metal, said liquidgcontaining a quantity of said'metal salt-which is insufficient amount to completely develop the, said latentcontrasts but less than three times said amount for a time sufficient to completely develop the said latent contrasts, exposing the top sheet ofsaid hasten development of the same, and removing stack in'said solutionto infra-red radiation to 1 the top sheet to expose the underlying sheetto the infra-red radiation.
• a method of producing photographic metal contrasts which comprises stacking a plurality of .sheets of photographic material each of which comprises --a-ly0phi1ic support carrying; a lightsensitivesystem containinga diazonium compound-and a. mercurous salt and which hasbeen exposed to light toform a latent; photographic .scontrast gthereon in astable developing liquid having apH-lessthanl and; containing a metal salt reducible to a metal in'solution and a compound capable-of reducing themetal salt to'a metal saidwliquid containing a quantityof said 5 metal salt which is insufficient-amount to com- ,pletely develop thesaid latent contrasts but-less .than three times: said -a-mount fora time suffi- :cient to completely develop. the-said latent .contrasts.
• metal salt reducible to a metal in solution and a compound capable of reducing the metal salt to a metal said liquid containing a quantity of said metal salt which is in sufiicient amount to completely develop the said latent contrasts but which is less than three times said amount for a time suflicient to completely develop the said latent contrasts.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

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Cited By (1)

Citations (6)

• 0
  • NL NL70094D patent/NL70094C/xx active
  • BE BE485480D patent/BE485480A/xx unknown
• 1948
  • 1948-10-08 US US53605A patent/US2609295A/en not_active Expired - Lifetime
  • 1948-10-19 DE DEP18813A patent/DE810109C/de not_active Expired
  • 1948-10-22 GB GB27502/48A patent/GB690094A/en not_active Expired
  • 1948-10-25 FR FR974303D patent/FR974303A/fr not_active Expired

Patent Citations (6)

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