The production of sensitizing specks on silver halide grains

✍ Scribed by S.E. Sheppard; A.P.H. Trivelli; E.P. Wightman

• Publisher: Elsevier Science
• Year: 1927
• Tongue: English
• Weight: 28 KB
• Volume: 204
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(27)91590-7

✦ Synopsis

BY TAKING photomicrographs of the same silver halide grains of a photographic emulsion before and after treatment with allylthiourea sensitizer, and again after treatment with alkali, it has been shown that the sensitizer does not react with the silver halide uniformly over its surface but in discrete spots. These spots are distinct in appearance from specks of silver produced by photochemical decomposition of the silver halide. The latter were not formed during the time of making the photomicrographs, at least visible ones were not, when the light beam from the micro-illuminator was filtered with a Wratten E 2 filter. It was also shown that the alkali alone does not produce decomposition specks.