Archived posting to the Leica Users Group, 2005/06/19

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Subject: [Leica] Budding photographer...
From: scott at adrenaline.com (Scott McLoughlin)
Date: Sun Jun 19 14:08:17 2005
References: <6.1.0.6.2.20050614032300.06093048@192.168.100.42> <42AEDC80.30809@adrenaline.com> <6.2.1.2.2.20050614103646.00c67800@pop.med.cornell.edu> <6.1.0.6.2.20050614130623.05598d68@192.168.100.42> <42AF55C6.3030301@adrenaline.com> <6.1.0.6.2.20050615153221.05edd8a8@192.168.100.42>

Richard,

Sorry to reply so late, I've been sick.

IIRC, sodium sulfphite (a google will turn up the right chem if I got this
wrong) in many popular developers is a grain disolver. Hence the term
"solvent developers" for D76, XTOL and the like.

I was just speculating that XTOL in a Jobo with continuous agitation might
be increasing the grain solvency effect.

I use HC110, Acutol and the like, but with D76 and XTOL, I believe many
folks use higher dilutions to diminish or eliminate the grain solvency 
effect.
At higher dilutions, the sodium sulphite (?) can't do its magic.

So you might try a rerun of your XTOL / Jobo experiment with a more dilute
XTOL soup (more water, longer time).

Make sense?

Scott

Richard wrote:

> Scott, do you mean my comment re: my negs seem not as contrasty as 
> people said they would be? What exactly do you mean by "grain solvency 
> effects?"
>
> I will pick up the Cookbook next time I drop by K&S. I flipped through 
> it several times already.
>
> At 03:10 PM 6/14/2005, Scott McLoughlin wrote:
>
>> ....
>> I wonder if what you're seeing with XTOL in your Jobo tank is more
>> sodium sulfite sloshing around with greater grain solvency effects.
>> Dunno, just pure speculation.
>>
>> BTW, after you get going, you might find "The Film Developers Cookbook"
>> a good read. Fascinating stuff, especially when you can start to 
>> relate it to
>> one's own experimentations and results.
>> ...
>
>
> // richard (This email is for mailing lists. To reach me directly, 
> please use richard at imagecraft.com)
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information




In reply to: Message from richard-lists at imagecraft.com (Richard) ([Leica] Budding photographer...)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] Budding photographer...)
Message from chs2018 at med.cornell.edu (Chris Saganich) ([Leica] Budding photographer...)
Message from richard-lists at imagecraft.com (Richard) ([Leica] Budding photographer...)
Message from scott at adrenaline.com (Scott McLoughlin) ([Leica] Budding photographer...)
Message from richard-lists at imagecraft.com (Richard) ([Leica] Budding photographer...)