[pure-silver] Re: Developing Plus-X in Rodinal 1+100

  ----- Original Message ----- 
  From: titrisol
  To: pure-silver@xxxxxxxxxxxxx
  Sent: Wednesday, December 17, 2008 1:00 AM
  Subject: [pure-silver] Re: Developing Plus-X in Rodinal 
1+100


        So a better test would be to expose a roll of film 
and then develop snippets for 10, 20, 30, 40, 60, 120 
minutes and see if when the densitites becomes more or less 
the same as the previous time?





      The problem is duplicating the exhaustion of the 
developer. There is probably not enough film in a clip test 
to change developer activity. The idea is to develop a 
normal amount of film for the time that is supposed to make 
the developer completely inactive and then try developing 
more to see if it develops at all. The second film can be a 
clip test. My bet is that a small quantity of Rodinal would 
loose substantial activity after developing a roll of 120 
but will still develop to some degree. A bit of fogged film 
will do nicely for the second test. I think the original 
poster was saying that the diluted Rodinal would develop 
film up to a certain degree but would not increase density 
or contrast when time was extended beyond that. The best 
test of this is simply to develop two rolls of film each 
with fresh developer but extend the time of one well beyond 
the other and well beyond the time at which the developer is 
supposed to stop developing.
       If the idea is that the developer would be dead from 
aerial oxidation a clip test would do where the developer 
was left in a tank, or agitated in a tank with no film for 
the given amount of time.

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

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