[pure-silver] Re: re-using DDX

This method doesn't make much sense if you are developing one roll of
film on an occasional basis.  But if your developing tank holds 4 to 8
rolls at a time then it does.  There is some increase in contrast due to
the increased time and some decrease in density but it is in normal
bounds.  Usual instructions for this method say to limit the number of
times the developer is reused, most often 8 to 10 times.  If the
developer is not used for several days then the time factor increases to
15 or 20%.  Each time the developer is used the *previous* time (not the
first time) is increased by 10% so the increase is not simple.

The label is confusing because it is describing two different methods --
single shot and reuse.  Probably the most detailed explanation for this
method was given for Agfa Atomal.

For optimum results it's best to use single shot.  Photo finishers
usually used the reuse method to save money.

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Shannon Stoney
Sent: Friday, March 31, 2006 2:03 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [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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