The book of lantern ; being a practical guide to the working of the optical (1888)

Record Details:

Title:
The book of lantern ; being a practical guide to the working of the optical
Date:
1888
Publisher:
London : Wyman & Sons
Volume:
The book of lantern ; being a practical guide to the working of the optical (or magic) lantern ; with full and precise directions for making and colouring lantern pictures
Leaf #:
000157
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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144 THE BOOK OF THE LANTERN. be left if preferred until the tissue is quite dry. The glass and its print is placed in a dish containing water at the temperature of about 110 degrees if the print is wet; but should the print have been allowed to dry, the water must be some 10 degrees hotter. After allowing it to soak for a couple of minutes or so, the paper is raised at one corner, taking every precaution not to injure the sur- face; when it will readily separate from the film. The plate bearing the picture is then put into a solution of alum for a minute, and is placed in a rack to dry. Upon ex- amining a lantern slide so made, a slight granular appear- ance is observable in the high lights and the sky ; but this is not apparent when the image is projected on the lantern screen. The picture will have the usual grey tone, which is associated with f errous-oxalate development; but it can be turned to a rich brown by the following treatment:— . ( Potassium ferricyanide ... ... ... 100 grs. (Water 24 ozs. T, (" Uranium nitrate 100 grs. 15 (Water 24 ozs. Take equal parts of A and B and immerse the print in the mixture until the tone changes to the tint required. Then wash thoroughly and immerse for five minutes in a freshly made-up solution—hypo, three ounces ; water, six- teen ounces, wash. The prints that will best yield to this after-treatment are those in which the image is from any cause rather weak; for this final bath not only alters the tone, but acts as an intensifier.