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Film and Paper Expiration Dates

Photography (Basic) - Introduction to photography and other graphic techniques
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RED SENSITIVE EMULSION LAYER - PRODUCES CYAN  DYES GREEN SENSITIVE EMULSION LAYER - PRODUCES  MAGENTA  DYES BLUE SENSITIVE EMULSION LAYER - PRODUCES YELLOW DYES Figure 2-8.–Cross section of color printing paper. When the same negative is exposed on another sheet of paper with green light, a flat or not enough contrast print is produced. When the normal-contrast negative is printed with the proper combination of blue and green light, a print with natural contrast is produced; therefore, to  control  contrast  when  using  variable  contrast  papers, you can use a series of yellow and magenta filters to control  the  amount  of  blue  and  green  printing  light during  exposure. COLOR PRINTING PAPERS Color  printing  papers  are  for  printing  color negatives or color transparencies. Like color negative films, color printing paper can be identified by the suffixes  “color”  and  “chrome.”  These  papers  are designed  for  printing  color  negatives  and  color transparencies,   respectively. Like color films, color papers have three emulsion layers.  The  order  of  the  emulsions  is  reversed  in comparison to color films (fig. 2-8). The top emulsion layer is sensitive to red light and produces cyan dyes, the middle emulsion layer is sensitive to green light and produces magenta dyes, and the bottom emulsion layer is sensitive to blue light and produces yellow dyes. PAPER  SURFACES Photographic papers are available in a variety of paper  surfaces,  such  as  matt,  semimatt,  lustre,  high lustre,  pearl,  and  glossy.  The  use  of  different  paper surfaces  depends  on  the  final  application  of  the photograph. There are two paper surfaces that arc used frequently in Navy imaging facilities: glossy and matt. Paper that has a smooth, glossy surface provides a print with higher contrast and higher densities or color saturations, resulting in an apparently sharper image. This is due to the direct reflection quality of the paper surface (fig. 2-9, view A). Glossy papers are always used for photographic prints that are used to show fine detail, such as equipment damage or intelligence photographs. Light reflected from MATT paper is diffused and provides a softer, lower contrast image (fig. 2-9, view B). Because of the lower contrast, subject detail does not appear as sharp as an image on glossy paper. Matt papers are   used   commonly   for   portraiture   and   scenic photographs. PROPER HANDLING AND STORAGE OF FILMS  AND  PAPERS Care  in  handling  films  and  papers  prevents fingerprints,  abrasions,  and  scratches  on  the  surfaces  of these   materials.   You   should   particularly   avoid unnecessary contact between an emulsion surface and any other object. Only handle light-sensitive materials by the edges. Light-sensitive materials should be removed from their packages in a room that is clean, dust-free, and lightproof. The workbench and your hands should be clean and dry. Light-sensitive materials should be Figure 2-9.–Reflection of light of different surface paper. 2-10







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