Applications to Prevent Special Kinds of Fog

  • Gunther Fischer
Part of the Topics In Applied Chemistry book series (TAPP)


Yellow fog (dichroic fog) is caused by special conditions of emulsion making and processing [R-1, p. 126ff.] that favor physical development; it was a special problem of earlier black-and-white photography [R-27b]. Patents [cf. R-35; R-36] center on heterocyclic compounds (Chart 14.1):
  • BT [P-1460], also combined with thiosulfonates (e.g., 202c )[P-1461],

  • heterocyclic thiols (e.g., MBT) [P-1462], in a special case PMT derivatives (e.g., 32c) in the final bath after low-replenishment development [P-1463],

  • bis-triazolium salts (e.g., 629) [P-1464] or mesoionic nitron (57) [P-1465],

  • masked NBI (e.g., 294) on paper support with baryta coating [P-1466], and

  • DIR hydroquinones (e.g., 415) with Lippmann emulsions [P-872].


Colloidal Silver Silver Salt Iminodiacetic Acid Paper Support Filter Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Gunther Fischer
    • 1
  1. 1.LeipzigGermany

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