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)

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.