The influence of photographic developers containing hydrazine upon the characteristic curves of photographic materials. I

✍ Scribed by R. Eliot Stauffer; W.F. Smith; A.P.H. Trivelli

• Publisher: Elsevier Science
• Year: 1944
• Tongue: English
• Weight: 384 KB
• Volume: 238
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(44)90855-0

✦ Synopsis

Hydrazine and many of its derivatives have been known as developers of the photographic latent image since the publications of Andresen? .~ Furthermore, the use of hydrazines as halogen acceptors to decrease solarization in photographic emulsions has been described in the literature? This paper presents the evidence of a new phenomenon occurring under certain conditions during the development of silver halide emulsions in the presence of various hydrazine derivatives.

The phenomenon is characterized by increases in the inertia speed, I/i, and contrast (gamma) of the photographic materials studied as compared with those of normal control development.

DESCRIPTION OF THE PHENOMENON.

* "Toe" is arbitrarily defined as the log E range required to increase the density from o.15 above fog to I. 5 above fog. 5