Archived posting to the Leica Users Group, 2000/05/07
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on 7/5/00 10:37 AM, Dan Cardish at dcardish@microtec.net 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
photos: http://www.pinkheadedbug.com
music: http://www.jukebox.demon.co.uk