著者

宮本 五郎 村山 勇 宮川 俊夫 坂部 健

出版者

社団法人 日本写真学会

雑誌

日本写真学会会誌 (ISSN:18846327)

巻号頁・発行日

vol.19, no.3, pp.124-129, 1956-11-30 (Released:2011-08-11)

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Optimal amounts of phenidone and hydroquinone in D-76 type PQ developers (pH 8.7), are 0.2g and 5.0g per 1000cc each other, as shown in Fig. 1 and 2. This Formula (PQE) gives slightly more fog than D-76, but addition of 0.2g KBr or 0.01g benzotriazole retards fog (Fig. 3).Optimal pH ranges have been estimated in several kinds of developing formula (Fig. 4-13).PQ-MK (Fig. 15, 16) and PM-MK (Fig. 17, 18) developers give sensitivity about two to three times more than D-76.