Reference

The instability of free cyanide in photographic processing effluents

The instability of free cyanide in photographic processing effluents. Owerbach, Daniel (Photogr. Technol. Div., Eastman Kodak Co., Rochester, N. Y., USA). J. Appl. Photogr. Eng., 4(2), 72-6 (English) 1978. CODEN: JAPEDL. ISSN: 0098-7298. DOCUMENT TYPE: Journal CA Section: 60 (Sewage and Wastes) Section cross-reference(s): 74 No free CN- in significant amts. was found in untreated photog. processing effluents. These effluents contain ~1.5 g/L of total solids, of which 4-10 mg/L is ferrocyanide. When KCN (0.1-0.2 mg/L) is added to these photog. processing effluents, much of the CN- addn. disappears within 1-2 days. The effects of CH2O [50-00-0], ferrocyanide, hydroquinone [123-31-9], methylaminophenol sulfate [55-55-0], CD-3 [25646-71-3], hydroxylamine sulfate [10039-54-0], and SO32- on CN- instability were studied. Simulated photog. processing effluents were prepd. to investigate the factors that cause free cyanide instability.

Method for manufacturing tablet form chemicals for silver halide photographic material by two-stage press to assure dimensional stability

Method for manufacturing tablet form chemicals for silver halide photographic material by two-stage press to assure dimensional stability. Yoshimoto, Hiroshi (Konishiroku Photo Ind, Japan). Jpn. Kokai Tokkyo Koho JP 08339054 A2 24 Dec 1996 Heisei, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: ICM: G03C005-26. ICS: G03C005-29; G03C005-38; G03C007-407; G03C007-42. APPLICATION: JP 1995-146291 13 Jun 1995. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Claimed method by compressing the powder or granular chems. 32 times with the pressure of 400-4500 kg/cm2, where the powder/granular chems. contains 31 of (a) color developing agent of p-phenylenediamines, (b) hydroxylamine or the deriv., (c) carbonate of alkali metal, (d) ferric chelate of aminopolycarboxylic acid and (e) thiosulfate. The pressure ratio of (n-1)th press to n-th press is between 0.5 and 1.5. The method improves the uniformity of the tablets, and reduces the losses due to cracking and puncture during storage and/or prodn. stages. Thus, (a) 4-amino-3-methyl-N-ethyl-N-b-methanesulfonamidoethyl-aniline sesquisulfate, (b) bis-sulfo-ethyl-hydroxylamine sulfate and (c) a mixt. of Na diethylene-triamine-penta-acetate, p-toluenesulfonate, Na sulfite, LiOH monohydrate, and Na2CO3 were sep. 133986-51-3 and 25646-71-3 are just another two chemicals used in this study. granulated, then mixed together, added by Na salt of n-myristoyl-alanine, milled and pressed twice at the pressure of 450 kg/cm2 each to make the developer tablet with the mentioned advantages. .