![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 ... 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 ...](https://l450v.alamy.com/450v/wdn83c/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-7838-abstractmedium-1-negative-glass-4-x-5-in-or-smaller-wdn83c.jpg)
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 ...
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