[pure-silver] Re: perceptol 1+1 and grain
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 6 Nov 2007 13:42:57 -0800
----- Original Message -----
From: "Shannon Stoney" <shannonstoney@xxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, November 06, 2007 8:19 AM
Subject: [pure-silver] perceptol 1+1 and grain
back to an old topic of about a week ago. I bought some
perceptol today, but I suddenly realized that if you use
it full strength it's pretty expensive! What about using
it 1+1? Does that give you some fine grain qualities
(although maybe not as good as straight)?
--shannon
For a time I was using Microdol-X 1:1 by accident. It
delivered pretty good results but the main virtue of
Microdol and Perceptol are their extra-fine-grain
properties. These are obtainable only when used at full
strength. At 1:1 the grain is not as fine but film speed is
somewhat greater. At 1:3 the film speed and grain is the
same as with D-76 but the developer begins to show edge
effects, that is it boosts acuatance. Acutance is a term
invented by Kodak to mean the increase in apparent sharpness
that accompanies the exageration in contrast at the edges of
objects in the image. The eye interprets this as shapness
even though the actual rendition of detail (resolution) is
relatively poor. Because the scale of the effect is fixed it
is of less importance for medium and large format negatives
than it is for 35mm. If you want economy you might try
re-using the developer or replenishing it. I am not sure if
either Kodak or Ilford still makes a packaged replenisher.
Re-use can be done if the development time is extended a
little, however, there will be some change in shadow
contrast from the accumulated reaction products.
I find that most 35mm negatives do not have the
smoothness of tone rendition of larger negatives. This is a
hard quality to describe but is not hard to see. I find that
I begin to get this smoothness when using an already very
fine grain film, like 100T-Max with one of these developers.
The MSDS for Microdol-X and Perceptol suggest they are
identical. The fine grain agent appears to be sodium
chloride (table salt) but some old Kodak patents suggest
there may be some amine there also.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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