[pure-silver] Re: Stand developing

I agree with Richard, stand development is useful to compress the total
scale of a very contrasty subject.  You see this method described in
articles on the Zone System.  It should not be used as a general purpose
technique.

Jerry

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Wednesday, August 24, 2005 6:22 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Stand developing



----- Original Message ----- 
From: "jeffrey" <puresilver@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, August 24, 2005 12:34 PM
Subject: [pure-silver] Re: Stand developing


> Well, I gave it a shot - Rodinal 1:100 for 30 min. at
> about 72 deg. Strong agitation for the first 30-40 sec., 
> then let it sit.
>
> Most of the frames turned out OK (if a bit thinner than
> expected), but a few frames (with wide expanses of clear 
> sky) showed sprocket-hole streaks. Not pronounced, but 
> enough to ruin the frame. Seemed inconsistant thru the 
> roll.
>
> Not sure what to think.
>
   The sprocket hole streaks are typical of stagnant 
development. There is some convection of the reaction 
products of development when the film is vertical in the 
bath. Since there is no development going on at the sprocket 
holes there are not reaction products produced so there will 
be an area under them that is somewhat higher in density 
than in the adjacent spaces. The effect is present all over 
the film but may not be noticable where there are not small, 
well defined, areas of significantly high or low density. 
You will find the opposite adjacent to small, dense 
highlights, where there will be streaks of lower development 
due to bromide.
   Generally stagnant or stand development is done with the 
film horizontal. The reaction products accumulate in the 
vicinity of the development then and the effect is of 
lowered density of highlights and exagerated adjacency 
effects, which are controlled by diffusion in the emulsion.
   Stand development can be useful for some special effects 
but IMO is not good general practice. Frankly, I think Danny 
was lucky.
   Nonetheless, the pictures are excellent.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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