[pure-silver] Anti-Silvering Agent

    I've come across another patent that may be of some interest to the group. 
This one is USP 3,161,524 issued to Richard W. Henn and assigned to Eastman 
Kodak. In it Henn describes the use of Chlororesorcinol as a silver 
sequestering agent to prevent dichroic fog. He gives results using high solvent 
developers, in particular Kodak D-25 with and without the addition of the 
Chlororesorcinol which show that a relatively small amount of this substance 
completely eliminates the deposition of silver on the surfaces of high speed 
film. 
    I think it is possible that Chlororesorcinol may be the "X" in Microdol-X 
and its presence may be the difference between T-Max developer and T-Max RS. 
Kodak does not recommend the use of T-Max for sheet film due to dichroic fog. 
    Those with a better knowledge of photographic chemistry than I may want to 
have a look at this patent.


 

--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
Los Angeles, CA, USA
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