Fogged, direct positive silver halide emulsions containing a bleach inhibiting compound and a Dmin maintainer compound

In a Herschel reversal type direct positive silver halide emulsion having prefogged silver halide grains containing a desensitizing dye, the improvement comprising a combination of a bleach inhibiting compound which retards bleaching of fogging nuclei by short wavelength radiation and a different Dmin maintainer compound which inhibits residual latent image formation said bleach inhibiting compound being selected from the group consisting of 5-nitrobenzotriazole, 5-chlorobenzotriazole, 6-amino-2-(methylthio)-benzothiazole, 6-methyl-2-(p-amino-phenyl)-benzothiazole, 2-amino-6-methylbenzothiazole, 2-amino-6-methoxybenzothiazole, 2-amino-5,6-dimethylbenzothiazole, 6-amino-2-methyl-7-nitrobenzothiazole, 6-amino-4-mercaptobenzothiazole, 2-amino-5-nitrothiazole, 2-aminothiazole, 2-amino-4-methylthiazole, 2-amino-4,5-dimethylthiazole, 2-amino-5-(p-nitrophenyl-sulfonyl)-thiazole, 2-acetaminothiazole, 2-amino-4-phenyl-5-ethylthiazole, 2-amino-4-(chloromethyl) thiazole-HCl, 2-amino-5-nitrothiazole, 2,4-dihydroxythiazole-5-acetic acid, 2-amino-5-bromothiazole, 2-amino-5-ethyl-4-phenyl-oxazole, 4-amino-6-chloro-5-nitropyridine, 5-aminoindiazole, 4-benzoylimino-3-t-butyl-1,3-thiazilidine-2-thione, 4-benzoylimino-3-phenyl-1,3-thiazilidine-2-thione, and said Dmin maintainer compound being selected from the group consisting of 2-amino-5-nitropyridine, 2-amino-4-methyl-2-nitropyridine, 2-amino-4-methyl-3-nitropyridine, 2-amino-3-nitropyridine, pyromellitimide, 5-nitroindazole, 6-nitroindazole, 3-chloro-5-nitroindazole, 3-chloro-6-nitroindazole, 5-nitrobenzotriazole, 6-chlorobenzotriazole, benzotriazole, 3-amino-1H-1,2,3,-triazole, 2-amino-5-nitrothiazole, 2-methyl-6-nitrobenzothiazole, 2-mercapto-6-nitrobenzothiazole, 2-acetamido-5-(p-nitrophenylmercapto)-thiazole, 6-amino-2-methyl-7-nitrobenzothiazole, 2-amino-5-chlorobenzoxazole, 2-nitrothiophene, 5-nitrobenzimidazole, 5-nitro-2-benzimidazole-thiol, 8-nitro-quinoline, m-nitrobenzamidine, 5-nitroanthraquinone sulfonic acid and p-nitrobenzenediazonium fluoborate.