Abstract: The invention relates to an emulsion comprising tabular grains of greater than or equal to about 3.7 .mu.m area weighted mean equivalent circular diameter and thiourea sensitizer having the structural formula: ##STR1## wherein each of R.sub.1, R.sub.2, R.sub.3, and R.sub.4 independently can represent an alkylene, cycloalkylene, carbocyclic arylene or heterocyclic arylene, alarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4 can complete a 5- to 7-member heterocyclic ring; andeach of A.sub.1, A.sub.2, A.sub.3, and A.sub.4 independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group;with the proviso that at least one of A.sub.1 R.sub.1 to A.sub.4 R.sub.4 contains a nucleophilic group bonded to a urea nitrogen atom through a 2- or 3-member chain.

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.