The Desensitising of Silver Bromide-Gelatin Plates

Abstract

IT is well known that the more sensitive a photographic plate is, the greater the care that has to be taken with respect to the actinic value of the light used in the dark room during the operation of development. The less the amount of light used, the more difficult it becomes to control the result; and it is therefore not to be wondered at that attempts have been made to modify the course of procedure in such a way that the exposed plate could be developed in a fairly good light. During the last few years various so-called “desensitisers” have been put on the market; when the exposed plate is either treated with a solution of these before development, or when some of the de-sensitiser is added to the developer, the plate can safely be developed in a light which would otherwise give rise to very bad fogging.