Eastman-kodak Company

Michael John Haight

Jean Marie Buongiorne

Charles M Darmon

Mary Ellen Craver

Sheridan E Vincent

Charles S Christ, Jr

Barry C Kocher

Erika S McLarney

Paul A Schwartz

A ferric-EDTA bleach regenerator composition can be mixed with bleach overflow to provide a bleach replenisher for reversal color silver halide photographic processes. The bleach regenerator composition has a critically controlled pH between about 6.0 and about 6.5, and comprises a total bromide ion concentration of at least about 210 g/l, and ferric ion in an amount of at least about 50 g/l. At least 50% of the bleach overflow and the bleach regenerator composition are mixed in at least a 1:1 volume ratio. After pH adjustment to from about 5.4 to about 5.6, the pH adjusted replenisher is supplied to the bleach tank for use in the process.

Bleach regenerator composition and its use to process reversal color photographic elements

A multi-part color developing kit includes at least two parts (or solutions) of photochemical compositions that can be mixed to provide a color developing composition useful for obtaining color photographic images. A first aqueous solution is formulated with a color developing agent in free base form, an antioxidant for the color developing agent, an inorganic base, a triazinylstilbene optical brightening agent, an chemical base and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent. A second aqueous solution is formulated with a buffering agent, the same or different chemical base and a phosphonic acid metal ion sequestering agent. Both solutions have a pH and homogeneity to provide a clear color developing composition that is safer for use and disposal.

Multi-part photographic color developing composition and methods of manufacture and use

A homogeneous, ready to use, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from about 15:85 to about 50:50. In addition the concentrate includes a mixture of a specific polyaminopolyphosphonic acid and either a hydroxyalkylidene-diphosphonic acid or morpholinomethanediphosphonic acid (or salt thereof) for stability in the presence of calcium ions. This concentrate is prepared by mixing the components in a unique order for improved safety and manufacturability. It can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution to provide color images in photographic silver halide materials.

Calcium ion stable photographic color developing concentrate and method of manufacture

A homogeneous color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent. This concentrate is prepared in a unique manner, namely by combining the noted components and removing the sulfate anions commonly present in color developing agents by precipitation with alkali metal ions. The concentrate can be used to prepare photographic processing concentrates and working strength solutions.

Homogeneous photographic color developing concentrate

A homogeneous, ready to use, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from about 15:85 to about 50:50. In addition the concentrate includes a mixture of a specific polyaminopolyphosphonic acid and either a hydroxyalkylidenediphosphonic acid or morpholinomethanediphosphonic acid (or salt thereof) for stability in the presence of calcium ions. This concentrate is prepared by mixing the components in a unique order for improved safety and manufacturability. It can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution to provide color images in photographic silver halide materials.

Calcium ion stable photographic color developing concentrate and method

Multi-part photographic color developing composition and methods of

An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from about 15:85 to about 50:50. This composition is prepared in a unique manner, namely by combining the noted components, and removing the sulfate anions commonly present in color developing agents by precipitation with alkali metal ions, before addition of further components. The concentrate can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution.

Homogeneous single-part photographic color developing concentrate and

A conditioning or bleach accelerating solution is prepared by diluting a concentrate up to 25 times. The concentrate contains a formaldehyde bisulfite precursor salt at from 200 to 600 g/l, sulfite ions at 0 to 200 g/l, a bleach accelerating agent at from 1.5 to 25 g/l, and a metal ion chelating agent present at up to 60 g/l. The concentrate is free of sodium ions.

Photographic reversal process prebleach concentrate container

A processing kit for color reversal photographic elements includes several concentrate compositions that can be used to prepare the necessary working strength processing solutions. Each concentrate composition is packaged in a volume that is designed for dilution to the same predetermined working strength solution volume for a single use in color reversal processing.

Single-use processing kit for processing color reversal photographic

Photographic reversal process prebleach concentrate and method of use

A ferric-EDTA bleach regenerator composition can be made with bleach overflow to provide a bleach replenisher for reversal color silver halide photographic processes. The bleach regenerator composition has a critically controlled pH between about 6.0 and about 6.5, and comprises a total bromide ion concentration of at least about 210 g/l, and ferric ion in an amount of at least about 50 g/l. At least 50% of the bleach overflow and the bleach regenerator composition are mixed in at least a 1:1 volume ratio. After pH adjustment to from about 5.4 to about 5.6, the pH adjusted replenisher is supplied to the bleach tank for use in the process.

Photographic bleach regenerator composition formulated with bromide ion

Photographic reversal process prebleach concentrate

A photographic reversal bath concentrate is formulated in such a manner as to avoid precipitates while including new biocides and excluding propionic acid. The concentrate is prepared by adding stannous ion nucleating agent to a solution of an organic phosphonic or phosphinic acid chelating agent, followed by addition of a quaternary ammonium compound as the sole biocide at a concentration of at least about 1 g/l. The quaternary ammonium compound has a molecular weight of from about 175 to about 440.

Growing community of inventors

Rochester, NY, United States of America

Michael John Haight