[pure-silver] Re: re-using DDX

If that's what Ilford really says, the accuracy of their technical
writing has deteriorates together with their financial status... (This
is somewhat same as Kodak publications.)

Say you have one liter processing tank and two liter storage bottle.

Make two liter working strength solution.

Run the first round of development, with say 4 rolls in a liter.

Pour back the used dev to the bottle.

Now, you processed 4 rolls in 2 liters, that is,

                  2 rolls per liter.

Run the second round of development, with say 2 rolls in a liter.

Development time should be adjusted according to 2 rolls/liter from
the previous round.

If there is the third round, the development time should be adjusted
according to 3 rolls per liter.

And so on.


Methods others metntioned are inaccurate and irrelevant.
This is not a replenishing system, but most people are talking about
incorrect implementation of a replenishing system.


From: Shannon Stoney <sstoney@xxxxxxx>
Subject: [pure-silver] re-using DDX
Date: Fri, 31 Mar 2006 12:28:13 -0600

> I was reading the DDX bottle today and noticed the following:
> 
>       "For economy, DDX can be reused to process either a number of 
> films individually or multiple films in batches.  If a series of 
> films is being developed in a spiral tank, compensate for the loss of 
> development activity after developing the first film (or batch of 
> films) by increasing development time 10% for each successive batch. 
> This relies on the used developer...being poured back into the 
> working strength solution's storage bottle and mixed with the fresh, 
> unused part of the developer before processing the next film/batch."
> 
> 
> ??? I don't get it.  Pour the used developer back into some fresh 
> working solution and then add 10% to your times?  But, how much fresh 
> developer?  And how does that save any money if you need fresh 
> developer to do it?
> 
> --shannon
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