Eastman-kodak Company

Jacques Roussilhe

Siu C Tsoi

Claude G Goumont

Shirleyanne E Haye

Janet M Huston

Olivier Jean Poncelet

Hugh G McGuckin

John S Badger

John Demita Goddard

Danielle Marie Wettling

Llewellyn J Leyshon

John M Higgins

Gerard M Droin

Gerard R Sirand-Rey

Siu-Chung Tsoi

Method for developing a high contrast photographic material containing a polyhydrazide nucleating agent

A black-and-white photographic developing composition has improved stability and is more compatible with the environment when discarded. The composition includes one or more ascorbic acid developing agents and is essentially free of hydroquinone and similar developing agents. It comprises a mono- or disaccharide such as ribose, fructose, lactose, glucose or galactose as a stabilizing agent for the developing agent.

Ascorbic acid developing compositions containing sugar and methods of use

This invention concerns the developing of silver halide photographic products. Silver-laden slurries accumulate in developing baths. It is possible to eliminate these silver-laden slurries by placing the developing baths in contact with aluminosilicate polymers modified by sulfur groups. For example, a tank is fitted with a loop to feed the bath through a cartridge 16 that contains the elements that are permeable to the developing bath, and which contain the aluminosilicate polymer modified by the sulfur groups.

Method to extract silver from a photographic developer

A black-and-white photographic developing composition has improved stability and is more compatible with the environment when discarded. The composition includes one or more ascorbic acid developing agents and a preservative (such as a sulfite) and is essentially free of hydroquinone and similar developing agents. It comprises an &agr;-ketocarboxylic acid stabilizing agent at a molar ratio to the ascorbic acid developing agent of from about 0.05:1 to about 2.5:1, and at a molar ratio to the preservative of from about 0.05:1 to about 6.25:1.

Stabilized ascorbic acid developing compositions and methods of use

A black-and-white photographic developing composition has improved stability and is more compatible with the environment when discarded. The composition includes one or more ascorbic acid developing agents and a preservative (such as a sulfite) and is essentially free of hydroquinone and similar developing agents. Improved stability is provided using a sulfo-substituted organic compound as a stabilizing agent. Such compounds are either aliphatic sulfo compounds or hydroxy-free aromatic sulfo compounds.

Ascorbic acid developing compositions stabilized with sulfo compound and methods of use

This invention concerns a non-spectral sensitized radiographic product for exposure to ionizing radiation of energy equal to at least 40 keV containing at least 50 mg/dm,, which comprises a support covered with on at least one of its sides with a layer of silver halide emulsion in which at least 50% of the grains are tabular grains, and at least 0.05 mmol/mol Ag of a compound of formula

Product for industrial radiography

This invention relates to a method and a device for the processing of silver halide photographic materials. The method of the invention includes accurately measuring the concentration of a developing agent in a photographic developing solution to monitor the activity of the bath and/or the need to replenish it. This measurement is carried out using spectrophotometric means.

Method and device for the processing of silver halide photographic materials

A device for automatically measuring a concentration of a developing agent in a developing bath includes a voltage generator capable of generating at least one voltage ramp provided to feed a three-electrode cell; a potentiostat provided to maintain a constant potential difference between two electrodes; a peak detector provided to identify the maximum current flowing in the three-electrode cell that corresponds to the developing agent concentration; and a display unit provided to show the maximum current.

Automatic measuring device for the concentration of a developing agent

The present invention concerns an organic/inorganic developer composition comprising a regeneratable iron chelate, novel codevelopers of the phenidone type including one or more solubilizing groups that are not directly attached to the phenyl nucleus or to the pyrazolidino nucleus and optionally ascorbic acid. These compositions are particularly useful for the black-and-white development of films or photographic papers, in particular for the fast development of radiographic products.

Organic/inorganic developer composition

The present concerns compounds of the 3-pryazolidone type comprising solubilizing groups which are not directly attached to the phenyl ring or to the pyrazolidino ring. These compounds can be used as co-developing agents in the development of black and white photographic products.

3-pyrazolidone compounds and photographic developer solutions containing

The present invention concerns a method of replenishing an ascorbic acid developer used for developing silver halide photographic products. The method of the invention comprises the treatment of the developer by means of a resin having a greater selectivity for bromide ions than for carbonate ions and the replenishment of this developer by means of a solution, the concentration of the main components of which is predetermined in accordance with the quantity of developed silver. This invention simplifies the replenishment of ascorbic acid developers.

Method for replenishing an ascorbic acid developer

The invention concerns a developer solution for processing silver halide photographic products. This developer solution contains an ascorbic acid developing agent, a auxiliary developing agent which is a substituted phenidone and a development accelerator which is a thioether having an ammonium group, a triazolium thiolate or a substituted thioalkane.

Photographic developers containing a developing agent of the ascorbic

The present invention concerns a developer for silver halide photographic products comprising a co-developing agent of the 1-phenyl-3-pyrazolidinone type. These co-developing agents comprise solubilizing groups which are not attached directly to the phenyl ring or the pyrazolidine ring, and improve the stability of the developer composition.

Photographic developing composition

A novel inorganic composition for developing silver halide photographic products has improved stability in air. The composition comprises at least one oxidizable metallic ion, ethylenediamine tetraacetic acid and at least one additional complexing agent of formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are each independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a hydroxyl group, or a hydroxyalkyl group, R.sup.3 is --COOM wherein M is hydrogen or a counter-ion such as lithium, sodium or potassium, or --CONR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are each independently a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, and n, p and q are independently 1, 2 or 3.

Composition for developing an exposed photographic product having

The invention concerns a color negative process wherein a photographic material comprising silver chloride or silver bromide and a DIR or DIAR coupler is processed in the presence of a polyester comprising intralinear thioether atoms.

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Virey le Grand, France

Jacques Roussilhe