The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
000248
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 2023
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198 THE ADVANCE OF PHOTOGRAPHY The best known of these is the Blue or Cyanotype process. The paper, which must be kept in the dark and in a dry place, is sensitized by a mixture of potassium ferric3Tanide and a ferric salt. Such paper should be exposed under a negative in direct sunlight if possible until the parts which have received the most light — i.e. those under the more transparent parts of the negative — have passed through a deep blue to a somewhat red colour. To complete the print it is washed in changes of warm water until the ground is quite white ; the image in a deep blue colour will then remain on the paper. Such paper is, of course, much more useful for copying photographs of plans, etc., than for ordinary pictorial photography.