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Figure 10-18.Arrangement of materials for processing film
Color Negative Processing

Photography (Basic) - Introduction to photography and other graphic techniques
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303.41 Figure 10-19.–Agitation of a small tank. fixer into the sink. The fixer can be reused and then later saved  for  silver  recovery. 11. The film can be washed either in the tank or in a roll-film washer. When the tank is used, insert a hose down through the center of the reels until it is about 1/2 inch from the bottom of the tank. Adjust the water (at the same temperature the film was processed) so a steady overflow is created. Wash the film for about 20 minutes. When you use a rapid roll-film washer, again, adjust  the  water  temperature  and  place  the  reels containing the processed film into the washer. Adjust the rate of water flow until the reels start to turn. When the reels start to turn, adjust the rate of water flow until the reels stop turning. Set the timer and wash the film for about 5 minutes. 12. While the film is washing, rinse the processing tank, tank cover, and cap with clean water. Fill the tank with water (check the temperature) and add the wetting agent. After the film has been washed, place the film, still on the reels, into the wetting agent solution. Replace the tank cover and cap and agitate the film in the wetting solution very S-L-O-W-L-Y for 1 minute. 13. After 1 minute in the wetting solution, remove the loaded film reels from the tank. (Do not save the wetting  solution.) 14. To dry the film, attach the end of the film to a film clip in the drying cabinet. Let the film unwind from the reel as you slowly lower the reel. When the film is unwound, depress the grip clip (if the reel has one) or remove the film from the core of the reel. Squeegee the film and attach a second film clip to the lower end of the film. Close the drying cabinet door and dry the film. Photographer’s Data Sheets Sometimes  a  photographer's  data  sheet  will accompany film that enters your imaging facility to be processed. The photographer's data sheet will provide you with information on how the film was shot, lighting conditions, and specific processing instructions. When a photographer's data sheet accompanies the film or job order, you should process the materials specified by the form. Cleaning  Up 10-25 After processing, the darkroom and all equipment must be cleaned up immediately. Rinse thoroughly all processing  equipment:  tanks,  reels,  hangers, thermometers, funnels, and so forth, in clean, warm water. Place the clean equipment where it can dry before it is needed for the next processing run. Always keep the processing  room  shipshape. REVERSAL PROCESSING Normal   processing   of   black-and-white   film produces a negative; from this negative, a positive is made. However, by using the reversal process, you can produce   a   positive   image   directly   on   the black-and-white   film. In the reversal process, a negative image is first obtained by developing the original latent image in a developer  that  contains  a  silver  halide  solvent.  This developer dissolves some of the excess silver halides. After leaving the developer, the negative image is dissolved  away  in  a  bleach  bath.  The  silver  halides remaining are chemically “exposed” (fogged) and developed by a second developer that provides the positive  image. Not all black-and-white films reverse well. Films that  reverse  well  are  Kodak  Direct  Positive Panchromatic Film 5246 (35mm), T-max 100 Direct Positive Film, and Kodak Technical Pan Films (35mm). Instructions for reversal processing of these films can be found in the Photo-Lab-Index.







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