Lantern-slide making and exhibiting ([pref. 1905])

Page scan 00032 from Lantern-slide making and exhibiting

Record Details:

Title:
Lantern-slide making and exhibiting
Date:
[pref. 1905]
Publisher:
London, Marshall, Brookes & Chalkley
Volume:
Lantern-slide making and exhibiting
Leaf #:
00032
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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REDUCTION AND INTENSIFICATION. 19 first by reducing, and the second by intensification. To reduce a slide prepare the fol- Reducing Bath. ^.^ solutions . No. 1. Ferricyanide of potassium ... 1 oz. Distilled water 10 oz. No. 2. Hyposulphite of soda ... ... 1 oz. Water 10 oz. To one ounce of No. 2 add 10 minims of No. 1 and pour over the slide, which should have been pre- viously fixed and washed. The action of the re- ducer is rapid, and its effect upon the slide must be carefully watched; directly the density is sufficiently reduced the slide should be well washed in running water for half an hour. Most slides, especially if they are slightly veiled, are improved by a brief im- mersion for, say, half a minute in this reducer, the treatment having a very brightening effect upon the slide. Care, however, must be taken not to allow the action to proceed too far, or the more delicate detail will be eaten away. Slides which are too thin to require The Improve- t j le converse treatment, namely, in- SHdes!* tensification. The intensifier usually employed is the mercury one, but slides so treated are of doubtful permanence. The following method with silver nitrate is very reliable, but scrupulous cleanliness is necessary to ensure success. Intensification. No. 1. Pyro ... ... 60 gr. Citric acid ... ... ... 160 gr. Distilled water 10 02. D2 ••* V