DEAR LAURENCE,
I believe there is an entire category of stand development that
uses glycerin as (at least part of) the developer solvent. Others on the list
using this, please chime in...
CHEERS!
BOB
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Laurence Cuffe ;(Redacted
sender "cuffe" for DMARC)
Sent: Monday, February 08, 2021 11:30 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: More (Semi) Standing Around
I’ve been following this thread with interest. One thought occurred to me,
which was to add a thickening agent to the developer. Two possibilities, would
be either Xanthan Gum, or some form of a sugar syrup, I’m thinking in terms of
an additive which is not madly Ph. sensitive, and which is somewhat chemical
stable.
Has anyone played with these ideas? So far all I’ve got is an interesting range
of colour on BW paper, due, I think, to differences in “agitation” while
applying Lyles golden syrup mixed with Rodinol with a spoon, but no effective
images yet. I think the image colour is due to a range of silver particle sizes
in the emulsion (Mie effect? possibly?). The gum, which I will play with next,
will allow me to make up a developer, and then add the gum, 1% is effective and
play from there.
Best
Laurence Cuffe
On 8 Feb 2021, at 15:07, Tim Daneliuk <tundra@xxxxxxxxxxxxxx> wrote:
On 2/8/21 6:19 AM, BOB KISS wrote:
DEAR TIM,
Thanks so much for doing and posting your extensive testing. I
believe stand development was good enough for the majority of Atget's
photos. Of course, he was probably using plates and his emulsions were
probably more compatible with stand development...just guessing.
Pfft. Who did Aget think he was? Some kind of important photographer? :)
*****BUT, and this is a big BUT, (as it were! LOL!!!) stand development is
supposed to be done horizontally, not vertically. The bromide drag is due
to good ol' Sir Isaac Newton's apple, gravity!!! I am not suggesting that
the very short and widely spaced agitation periods are not beneficial but
you may find they are less necessary if you lay (or even tape) the film
flat, horizontally at the bottom of a tray. You speak of tanks and holders
which leads me to believe that the film is vertical in the developer.
Yes, I have seen guidance to this effect in other places. People are using
either trays or some sort of tube that holds the film horizontally.
The problem is that I have not figured out how to solve these problems
with tray processing:
- How do I process 4-8 sheets at a time and let them stand?
- How do I avoid emulsion scratches?
I do have a sort of wild idea I want to try. I want to take the insert
from the Yankee tank (which holds film vertically as you note) and
stick it in a large tank *horizontally* thereby attempting to do a
"spaced" stand in a big open tank. If that works, I get both the
proper orientation and the convenience of multi-sheet processing. The only
issue I can see is the possibility of Mr. Newton showing up in a new with
with bromide from the top sheets spilling down into the lower sheets.
Methinks
the trick would be to space the film widely.
--
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Tim Daneliuk tundra@xxxxxxxxxxxxxx
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