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Date: 2013-04-26 11:29:54Electromagnetic radiation Ultraviolet UV filter Staining Color photography Wood stain Filter Fluorescence Photographic filter Chemistry Optical filters Optics | PRESERVATION Tech Notes U.S. DEPARTMENT OF TH E INTERIOR NATIONAL PARK SERVICE WASHINGTON , D.C .Add to Reading ListSource URL: www.nps.govDownload Document from Source WebsiteFile Size: 3,47 MBShare Document on Facebook |