[pure-silver] Re: Agitation and Contrast
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 12 Jul 2009 02:47:10 -0700
----- Original Message -----
From: "Elias Roustom" <elroustom@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, July 11, 2009 5:16 PM
Subject: [pure-silver] Agitation and Contrast
Kodak instructions: "Agitation should consist of 2 to
5cycles, depending on the contrast you need and the
type of tank."
This might be common knowledge, but it hasn't trickled
down to me yet...
more agitation yields more contrast? It also adds grain
right?
Type of tank?
Thanks in advance,
Elias
Where did you see this? Generally Kodak seems to
recommend a consistent agitation method and variation of
overall development time for contrast control. At least
fairly recent Kodak instructions are to agitate invertable
tanks 4 to 5 times in 5 seconds once every 30 seconds.
Reducing agitation will certainly reduce contrast by
reducing the amount of development but may also result in
uneven development. If agitation is made continuous then
development time must be reduced for the same contrast. This
is found in development charts for drum and tray agitation.
Grain generally increases somewhat with increased
development. That's one reason that pushing film results in
coarser grain.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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