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![Government discovers method to preserve [...] (3) Test for fading. D. Levinsky of the Bureau of Standards is pictured exposing a developed film to light from a carbon arc to find whether the photographic image fades. The carbon-arc light simulates daylight closely and therefore is used for many materials as a standard source of illumination for this purpose, 7/8/38](https://cache.getarchive.net/Prod/thumb/cdn4/L3Bob3RvLzIwMTUvMTEvMjUvZ292ZXJubWVudC1kaXNjb3ZlcnMtbWV0aG9kLXRvLXByZXNlcnZlLTMtdGVzdC1mb3ItZmFkaW5nLWQtbGV2aW5za3ktb2YtdGhlLTEwMjQuanBn/40/32/webp "Government discovers method to preserve [...] (3) Test for fading. D. Levinsky of the Bureau of Standards is pictured exposing a developed film to light from a carbon arc to find whether the photographic image fades. The carbon-arc light simulates daylight closely and therefore is used for many materials as a standard source of illumination for this purpose, 7/8/38")
Government discovers method to preserve [...] (3) Test for fading. D. ...
Public domain photograph, 1910s-1920s portrait, American, free to use, no copyright restrictions image - Picryl description
Government discovers method to preserve ... (3) Test for fading. D. Le...
A black and white photo of a man in a kitchen, Library of Congress Harris and Ewing collection Gift; Harris & Ewing, Inc. 1955. General information about the Harris & Ewing Collection is available at http://hd... More