Agfa motion picture topics (Apr 1937-June 1940)

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HARBOR SCENE" By H. R. Champlin Contax Camera — Agfa Superpan — 1/100 at FI6 aging period, the dry-hypersensitized emulsion remains free from fog. After three to four weeks the fog value of the emulsion is even somewhat lower than the fog value of the original film. It is known that the stability of films or plates that have been hypersensitized by bathing methods is very poor. The fog of fhe emulsion rapidly increases with age, and materials so treated are usually ruined by excessively high fog in about four weeks. This is another distinct difference in behavior between wet and dry-hypersensitized materials. After losing their additional sensitivity, dry-hypersensitized emulsions are still in a usable condition. The speed is somewhat less than that of the original untreated film, but the clearness is at least the same or better. There is another advantage. Emulsions that have been treated with mercury vapor, but have not been used before losing the additional sensitivity, can be re-hypersensitized by treatment in the mercury atmosphere a second or even a third time. As far as could be seen, by comparing treated material with an untreated type, the grain size was not noticeably affected. Page Six