[pure-silver] Re: re-using DDX

This method was popular years ago.  It means to add enough fresh working
strength developer to maintain the original volume.  Say you made up 2
liters of working strength.  You would save 0.5 liter to top off the 1.5
liters that you are using to develop films.  Each time you use the
developer a small amount is lost.  So you have to add a small amount to
maintain the 1.5 liter volume.  After each use you would add 10% to the
development time to compensate for the loss of activity in the used
developer.


OK, I think I see what you mean. But it seems a little imprecise. Like, how MUCH fresh solution to use? The directions on the bottle don't say.

It also says, "for optimum results use once and throw away." How sub-optimum is it if you re-use the old developer, topping off with fresh?

--shannon


Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Shannon Stoney
Sent: Friday, March 31, 2006 1:28 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] re-using DDX


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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