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A Method of Producing Reversed Dye Images by J.I. Crabtree is a Engineering article available to read on EtoBox.

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By J. I. Crabtree. REVERSED dye images may be obtained on motion picture film or any other suitable support by first dyeing the fikm with a dye that is capable of being reduced to a leuco base, and after tinting, bleaching in an ordinary acid hypo-bath, washing, and then removing the silver image by using a solvent of silver such as Farmer's reducer. Two methods of procedure are described : The first method making use of a single bath containing the dye as well as the bleaching agent, and the second, dyeing or tinting the gelatin silver image in one bath and then bleaching it in a separate bath. In both cases the film is subsequently washed and then immersed in the reducing solution. The success of the process is largely dependent on the careful adjustment of the time of bleaching. Thorough washing before the film is placed in the reducing bath is of importance, otherwise the leuco base is mordanted to the silver ferrocyanide image and on prolonged washing is oxidized to the dye. The result is the production of a positive dye image. This difficulty, alofig with several others, is mentioned, and suggestions are given for avoiding them. Several interesting effects may he obtained by

Who reads A Method of Producing Reversed Dye Images?

Author

J.I. Crabtree

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0016-0032)

Published

1922

Language

EN

Field

Engineering (Physical Sciences)