Archived posting to the Leica Users Group, 2000/05/07

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Subject: Re: [Leica] (Xtol) Why 1+3 dilution ?
From: Johnny Deadman <>
Date: Sun, 07 May 2000 21:30:20 +0100

on 7/5/00 10:37 AM, Dan Cardish at wrote:

> But more dilution implies longer development times which in turn implies
> longer exposure to the sulphite which implies less grain.
> Dan C.
> At 10:03 AM 07-05-00 +0100, Johnny Deadman wrote:
>> With sulfite developers like xtol (+ d76 and d23 and many more), more
>> dilution = lower concentration of sulfite = more grain

Okay, my first reply was too flip. How about this:

"Graininess is slightly increased on dilution, since the solvent [JB: this
is sulfite in the case of Xtol and D76] effect is not as great, but the
increase is small becaause the film spends a longer time in contact with the
sulfite while in the developer"

    Antscherl & Troop, THE FILM DEVELOPING COOKBOOK, p40 (from the chapter
on solvent developers)

So we're both  right, only I'm just a little bit more right!

- --
Johnny Deadman