Abstract: A silver halide emulsion comprising radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing a hexacoordination complex of an iridium ion in which at least half of the coordination sites in the hexacoordination complex are provided by halogen or pseudohalogen ligands, and at least one coordination site is provided by a ligand comprising a azole ring containing a chalcogen atom and a nitrogen atom, wherein the azole ring is substituted at the 5-position with a halide ion. The invention provides emulsions containing with a preferred class of iridium dopants which are especially useful for improving reciprocity performance in silver halide emulsions with minimal or no impact on other aspects of photographic performance. These dopants give a superior balance of reciprocity and other photographic properties compared to other iridium dopants exemplified in the prior art.

Abstract: A method for forming a radiation-sensitive high chloride silver halide emulsion is described comprising growing cubical silver halide grains having a central portion accounting for up to 98 percent of total silver of the grains which central portion contains an iridium coordination complex dopant, and chemically sensitizing the surface of the emulsion grains at a pH of at least 5.75. Localized addition of the known in the art reciprocity-controlling iridium dopants to an internal portion of the emulsion grains and chemical finishing of such an emulsion at elevated pH conditions improves reciprocity and latent image stability of the formed high chloride emulsions.

Abstract: The invention relates to a method of forming a silver halide emulsion comprising forming a silver chloride emulsion, adding spectral sensitizing dye, sulfur, and gold sulfide to said emulsion, heating said emulsion to chemically and spectrally sensitize said emulsion, and cooling said emulsion.

Abstract: A radiation-sensitive emulsion comprised of high chloride silver halide grains having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I): [RuL6]n wherein n is −2, −3 or −4, and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; and a second dopant comprising an iridium coordination complex having ligands each of which are more electropositive than a cyano ligand; wherein the first dopant and the second dopants are located together in a common dopant band in an interior shell region of the central portion of the silver halide grains that surrounds at least 70 percent of the silver and, with the more centrally located silver, accounts for 90 percent of the silver halide forming the grains, and wherein the second dopant is present in the silver

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing (i) a first dopant comprising an iridium coordination complex containing at least one thiazole ligand and (ii) a second dopant comprising an iridium coordination complex containing at least one substituted thiazole ligand. The combined use of first and second iridium dopants in accordance with the invention provides enhanced toe contrast softening, and can also result in improved latent image keeping stability relative to that expected from the individual effects of such dopants.

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I) and a second dopant of Formula (II):

Abstract: A radiation-sensitive emulsion comprised of high chloride silver halide grains having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I): [ML6]n wherein n is zero, −1, −2, −3 or −4; M is a filled frontier orbital polyvalent metal ion, other than iridium, and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; wherein a second dopant comprising an iridium coordination complex having ligands each of which are more electropositive than a cyano ligand is located together with the first dopant in a common dopant band within the central portion of the silver halide grains.

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing (i) a first dopant comprising an iridium coordination complex containing at least one thiazole ligand and (ii) a second dopant comprising an iridium coordination complex containing at least one substituted thiazole ligand. The combined use of first and second iridium dopants in accordance with the invention provides enhanced toe contrast softening, and can also result in improved latent image keeping stability relative to that expected from the individual effects of such dopants.

Abstract: A photographic recording element comprising a support bearing at least one radiation-sensitive silver halide emulsion layer comprising silver halide grains containing greater than 50 mole percent chloride, based on silver, and having greater than 50 percent of their surface area provided by {100} crystal faces, wherein (i) a first fraction which comprises from 10-90 wt % of the silver halide grains consists of grains which have a central portion which contains at least 10−7 mole of a hexacoordination metal complex which satisfies formula (I) per mole of silver and less than 10−10 mole of a hexacoordination metal complex which satisfies formula (II) per mole of silver, and (ii) a second fraction which comprises from 10-90 wt % of the silver halide grains consists of grains which have a central portion which contains at least 10−10 mole of a hexacoordination metal complex which satisfies the formula (II) per mole of silver and less than 10−7 mole of a hexacoordination metal com

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I) and a second dopant of Formula (II): [RuL6]n  (I) wherein n is zero, −1, −2, −3 or −4, and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; [TE4(NZ)E′]r  (II) wherein T is Os or Ru; E4 represents bridging ligands which can be independently selected; E′ is E or NZ; r is zero, −1, −2 or −3; and Z is oxygen or sulfur; wherein the dopant of Formula (II) is selected from hexacoor

Abstract: A method of imaging employing sensitized high chloride silver halide emulsions which exhibit improved speed and high intensity reciprocity performance for use with short duration, high intensity exposure optical and digital exposure systems. The method comprising providing a photographic element comprising at least one high chloride silver halide emulsion layer, exposing said element utilizing a high intensity actinic radiation exposure for an exposure time of less than {fraction (1/100)} second, and developing said element to produce a photographic image, wherein the high chloride silver halide emulsion layer is comprised of silver halide emulsion grains containing at least 90 mole percent chloride, based on silver, obtained by providing a high chloride host emulsion, bringing a Lippmann emulsion comprising primarily fine silver bromide grains doped with iridium into contact with said high chloride host emulsion, and subsequently chemically sensitizing the high chloride emulsion.

Abstract: This invention relates to a silver halide photographic element comprising at least one silver halide emulsion layer and further comprising an antifoggant represented by the following Structure I: wherein R1 is an aliphatic or cyclic group, R2 and R3 are independently hydrogen or bromine as long as at least one of them is bromine, L is a divalent linking group, m and n are independently 0 or 1, and SG is a solubilizing group that has a pKa of 8 or less.

Abstract: The invention relates to a photographic element comprising a base material, at least one exposure side photosensitive silver halide layer, and at least one backside photosensitive silver halide layer, wherein said face side photosensitive layer has lower speed than said backside photosensitive layer, and wherein said base material has a percent transmission of between 35 and 60%.

Abstract: A radiation-sensitive emulsion is disclosed comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for from 95 to 99 percent of total silver and containing two dopants selected to satisfy each of the following class requirements: (i) a hexacoordination metal complex which satisfies the formula (I)[ML.sub.6 ].sup.nwherein n is zero, -1, -2, -3 or -4; M is a filled frontier orbital polyvalent metal ion, other than iridium; and L.sub.6 represents bridging ligands which can be independently selected, provided that least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; and (ii) an iridium coordination complex containing a thiazole or substituted thiazole ligand.

Abstract: This invention relates to silver halide photographic element comprising a silver halide emulsion chemically sensitized in the presence of an isothiazolin-one compound represented by the formula ##STR1## wherein R.sup.1 is a substituent; and Z is a substituted or unsubstituted saturated ring, wherein the isothiazolin-one compound was added after precipitation of the emulsion.

Abstract: The invention relates to an emulsion comprising sharp cornered silver chloride grains, said grains having a rounding index less than 0.3 and dithiolone dioxide.

Abstract: This invention relates to a silver halide photographic element comprising a silver halide emulsion precipitated and/or chemically sensitized in the presence of an sulfenimide compound represented by the formula: ##STR1## wherein M represents the atoms necessary to form, with R.sup.1 and R.sup.2, a five or six-membered ring or a multiple ring system; w is 1 or 0, wherein when w is 0, R.sup.1 and R.sup.2 are independently substituted or unsubstituted aliphatic, aromatic or heterocyclic groups, and when w is 1, R.sup.1 and R.sup.2 are independently carbonyl or sulfonyl groups; R.sup.3 is independently a substituted or unsubstituted aliphatic, aromatic or heterocyclic group and x is 0 or 1.

Abstract: A dimethylamine silver chloro-iodide complex is used as a single source precursor for iodide incorporation in silver chloride crystals.

Abstract: The invention relates to a photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound.

Abstract: The invention relates to a photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound of Formula I:Z.sup.1 --X.sup.1 O.sub.2 S--M.sup.1 (I)and a compound of Formula II:Z.sup.2 --X.sup.2 O.sub.x --M.sup.2 (II)wherein X.sup.1 is sulfur and X.sup.2 is selected from the group consisting of sulfur and selenium, M.sup.1 and M.sup.2 are independently selected from group consisting of a metal ion and ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from the group consisting of hydrogen and an alkyl of 1-3 carbon atoms, and Z.sup.1 and Z.sup.