[pure-silver] Re: What happens when XTOL dies

I guess you can always contact Dick & Silvia Toolbox.
IIRC they are the guys that developed Xtol from the start.


--- Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:

> 
> ----- Original Message ----- 
> From: "Bob Younger" <younger@xxxxxxxxxxxxxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Sunday, February 26, 2006 3:57 PM
> Subject: [pure-silver] Re: What happens when XTOL dies
> 
> 
> > I'm not going to postulate that my experience is the
> > definitive answer, but as Richard K. pointed out, this has
> > come up in a number of forums over the past few years. One
> > discriminator seems to be that mixing the stock and 
> > working
> > solutions with distilled water makes a difference. My
> > recollection of earlier discussions was that people who
> > mixed with tap water were the ones who experienced the 
> > early
> > death of their Xtol. I recall that everyone who mixed with
> > distilled water said they had never experienced this
> > problem; and a Kodak representative weighed in on the
> > discussion and said that ALL chemicals were designed to be
> > mixed with distilled water because the variability of tap
> > water around the world was WAY too much for manufacturers 
> > to
> > plan/compensate for.
> > I used Xtol for a couple of years before discovering Pyro
> > (which I use now) and experienced the sudden death 
> > syndrome
> > once, when I mixed it with tap water.
> > I KNOW that someone is going to reply to this and say they
> > ALWAYS mix with distilled water; and ALWAYS use clean
> > equipment; and they have experienced the subject syndrome.
> > So, let me just add that using distilled water and
> > absolutely clean equipment is the process chemists use to
> > ensure consistency in experiments and production. As
> > photographers we risk a measure of inconsistency if we 
> > don't
> > at least follow those proven processes. I'm not here
> > defending Xtol, but I know that many photographers use tap
> > water to mix their chemicals, including stock solutions. 
> > All
> > I'm advocating is minimizing the variables.
> >
> > Bob Younger
> 
>    Distilled water is always safe but most packaged photo 
> chemicals contain agents to deal with trace elements and 
> salts in the water. Some of these materials don't bother 
> most processing solutions.
>    I've seen some speculation about Xtol by actual chemists. 
> One idea is that there is a reaction with Iron in the water 
> but the Iron has to be in certain states, others have no 
> effect.
>    If there has ever been a definitive analysis of what 
> causes this problem I am unaware of it. Kodak no longer 
> maintains a research laboratory so the chances are that we 
> will never know unless some advanced chemist decides to find 
> out on his own. Again, I refer people to Ryuji Suzuki's web 
> site where he has a couple of formulas for developers with 
> similar characteristics to Xtol but without its drawbacks.
> 
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx 
> 
>
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