Government discovers method to preserve film. Scratch resistance, film, particulary the emulsion side, may become damaged through scratching. D. Levinsky of the Bureau is using an instrument which tests the resitance of a film by measuring the width of a scratch produced by a diamond point under a given load. Another method is to put a piece of film in a bottle of sand, revolve the bottle a certain number of times, then measure the haxiness developed. Many commercial treatments designed to increase the hardness of the emulsion have been investigated, 7/8/38
Summary
Public domain photograph of laboratory, scientist, free to use, no copyright restrictions image - Picryl description
Tags
Date
1938
Contributors
Harris & Ewing, photographer
Source
Library of Congress
Copyright info
No known restrictions on publication.