[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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