Abstract: An inkjet ink composition comprising: (a) water; (b) dispersed pigment particles; and (c) at least one humectant; wherein the pigment particles are present from about 4.5% by mass to about 10% by mass, and the pigment particles have a mass weighted mean Stoke's diameter of from about 35 nm to about 70 nm wherein the Stoke's diameter is determined by differential centrifugal sedimentation of the particles through a fluid in a disc centrifuge. The present invention employs specified sedimentation particle sizing criteria for selection of appropriate pigment particle sizes at high pigment concentrations to obtain improved ink performance. Further embodiments of the invention also demonstrate that the criticality of humectant types and levels employed in an ink can also become much more important at high pigment loading in order to obtain desired performance.

Abstract: An inkjet ink composition comprising: (a) water; (b) dispersed pigment particles; and (c) at least one humectant; wherein the pigment particles are present from about 4.5% by mass to about 10% by mass, and the pigment particles have a mass weighted mean Stoke's diameter of from about 35 nm to about 70 nm wherein the Stoke's diameter is determined by differential centrifugal sedimentation of the particles through a fluid in a disc centrifuge. The present invention employs specified sedimentation particle sizing criteria for selection of appropriate pigment particle sizes at high pigment concentrations to obtain improved ink performance. Further embodiments of the invention also demonstrate that the criticality of humectant types and levels employed in an ink can also become much more important at high pigment loading in order to obtain desired performance.

Abstract: This invention relates to an organothiosulfonato Au(I) complex having the formula [A—SO2S—Au—SSO2—A]n−M+n wherein M is a cationic counter ion; A is a substituted or unsubstituted organic group; and n is 1 to 4; and wherein the compound is symmetrical. It further relates to the synthesis of said compounds.

Abstract: This invention relates to an organothiosulfonato Au(I) complex having the formula

Abstract: This invention relates to a photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising a water soluble Au(I) complex having the formula [L—Au—L]n−M+n wherein the complex is symmetrical; L is an organothiosulfonato ligand which is an antifogging, stabilizing, or sensitizing compound, n is 1 to 4, and M is a cationic counterion. This invention further relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising an organothiosulfonato Au(I) complex having the formula [A—SO2S—Au—SSO2—A]n−M+n wherein M is a cationic counterion; A is a substituted or unsubstituted organic group; and n is 1 to 4; and wherein the compound is symmetrical. It further relates to a method of preparing a silver halide emulsion utilizing said organothiosulfonato Au(I) complexes.

Abstract: This invention relates to an organomercapto Au(I) complex having the formula [(M—SOL)n—A—S—Au—S—A—(SOL—M)n]M wherein M is a cationic counterion; SOL is a solubilizing group: A is a substituted or unsubstituted divalent organic linking group; and n is 1 to 4 and wherein the compound is symmetrical. It further relates to a method of manufacturing an organomercapto Au(I) complex comprising reacting an Au (I) complex with an organomercapto ligand and isolating the resulting organomercapto Au(I) complex from the reaction mixture.

Abstract: A method of screening a water soluble gold complex for use as a sensitizer in a silver halide photographic element comprised of experimentally measuring the electrochemical potential of the gold complex and then determining if the electrochemical potential falls within a predetermined utility window.

Abstract: A method for preparing ultra-pure silver from a crude silver mixture containing metallic and/or non-metallic impurities, said method comprising; dissolving the crude silver mixture in nitric acid to form a crude silver nitrate solution; adding a first selective reducing agent to the crude silver nitrate solution to precipitate a silver/contaminant matrix and form a partially purified silver nitrate solution; separating the partially purified silver nitrate solution from the precipitated silver/contaminant matrix; adding a second selective reducing agent to the partially purified silver nitrate solution to precipitate silver powder; and isolating the silver powder.

Abstract: A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to substantially remove carbonaceous material; treating the roasted crude silver halide matrix with ammonium hydroxide to dissolve the silver halides and form an ammonium hydroxide reaction mixture; adding an initial reducing agent to the ammonium hydroxide reaction mixture to precipitate a crude silver powder mixture; separating the crude silver powder mixture from the ammonium hydroxide reaction mixture dissolving the crude silver powder mixture in nitric acid to form a crude silver nitrate solution; adding a first selective reducing agent to the crude silver nitrate solution to precipitate a silver/contaminant matrix and form a partially purified silver nitrate solution; separating the partially purified silver nitrate solution from the precipitated silver/contaminant matrix; adding a second selective reducing

Abstract: This invention relates to an organomercapto Au(I) complex having the formula ##STR1## wherein M is a cationic counterion;SOL is a solubilizing group;A is a substituted or unsubstituted divalent organic linking group;and n is 1 to 4 and wherein the compound is symmetrical.It further relates to a method of manufacturing an organomercapto Au(I) complex comprising reacting an Au(I) complex with an organomercapto ligand and isolating the resulting organomercapto Au(I) complex from the reaction mixture.

Abstract: This invention relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising an organomercapto Au(I) complex having the formula?(M--SOL).sub.n --A--S--Au--S--A--(SOL--M).sub.n !Mwherein M is a cationic counterion;SOL is a solubilizing group:A is a substituted or unsubstituted divalent organic linking group;and n is 1 to 4 and wherein the compound is symmetrical.It further relates to a method of preparing a silver halide emulsion utilizing said organomercapto Au(I) complexes.