Konishiroku Photo Industry Co., Ltd.

Sankyo Company, Limited

Hiroyuki Inokuma

Tsuneo Wada

Takashi Sasaki

Teiji Habu

Hisashi Yamaguchi

Hiroki Ishii

Takayoshi Omura

Nobuo Soma

Isao Kawamoto

Tomio Nakajima

Kiyomitsu Mine

Shizuo Saito

Koichi Horigome

Yasushi Kawaguchi

Yayoi Kobayashi

Sadao Sugita

Yukio Morifuji

A magnetic recording medium having a magnetic layer and optionally a backing layer, wherein at least one of said magnetic layer and said backing layer contains a fungicide selected from the group consisting of 2-(4-thiazolyl) benzimidazole, N-(fluorodichloromethylthio)-phthalimide, N,N-dimethyl-N'-phenyl-N'-fluorodichloromethylthio-sulfamide.

Magnetic recording medium

A process for hardening gelatin which comprises reacting photographic gelatin with a compound of the general formula

Gelatin hardening process

A process for hardening gelatin which comprises reacting photographic gelatin with a compound of the general formula ##SPC1## Wherein R.sub.1 and R.sub.2 individually are halogen, an aryloxy group which may have substituents, or an arylthio group which may have substituents; X is a simple bond, an alkylene group which may have substituents --CO, --CO--R.sub.5 --CO-- (in which R.sub.5 is an alkylene group which may have substituents) or --R.sub.6 --(O--R.sub.6).sub.n -- (in which R.sub.6 is an alkylene group which may have substituents and n is a positive integer); an Y is a saturated or unsaturated hydrocarbon group which may have substituents, or a group ##SPC2## (in which R.sub.3 and R.sub.4 individually are halogen).

Substances of the structure ##EQU1## wherein Z is phosphorus, X.sup.-is Cl.sup.-, Br.sup.-, ClO.sub.2 .sup.- or BF.sub.4 .sup.-, and R.sub.1 - R.sub.4 are alkyl or aromatic groups are excellent inhibitors of fog formation when incorporated in photographic emulsions containing silver halides.

Silver halide emulsion containing an arylphosphonium salt as antifoggant

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Hino, Japan

Hiroyuki Inokuma