[pure-silver] Re: prepackaging my developer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 9 Nov 2009 13:58:53 -0800
----- Original Message -----
From: "Jean-David Beyer" <jeandavid8@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, November 09, 2009 9:29 AM
Subject: [pure-silver] Re: prepackaging my developer
Dennis Purdy wrote:
I have an ongoing project which I am using a specific
film developer for. It is Ansco 47 which must be mixed
from scratch and uses all the usual suspects for
chemicals. I am getting tired of mixing it up everytime
I want to use it so I am thinking of prepackaging it in
zip lock bags. I am wondering if there is some reason I
should keep any of the chemicals separate within the
mix, like the metol or
You generally should dissolve the ingredients in the order
listed in the formula. In particular, though, I seem to
recall that the Metol does not dissolve well in sulfite
solutions, so that is usually dissolved first.
Hydroquinone or sodium carbonate. I know that D76 comes
in a single bag and it uses most the same stuff.
I do not know how Kodak manage this. Maybe the sulfite is
packaged like some time-release medications.
My mix calls for Metol, Hydroquinone, Sodium Sulfite,
Sodium Carbonate, Sodium Bisulfate and potassium
Bromide. If I just weigh it out and put it in batches in
zip lock bags will there be any internal oxidizing or
other bad reactions over time?
What I do for paper developer is mix something like D-72
stock solution in 4 litre bottles. I then mix one part of
that with 2 parts of water to get working solution. I put
the date I mixed it on the bottle and use it unless it
gets too old. If you do not use a gallon of the stuff
every few months, maybe you exaggerate the difficulty of
making a new batch every so often.
I would worry about ZipLock bags being too porous for
developing agents, so they might oxidize too quickly,
depending on how fast you used them. I would also wonder
if you could mix the dry chemicals adequately before you
packaged them. Perhaps you could.
--
.~. Jean-David Beyer Registered Linux User
85642.
/V\ PGP-Key: 9A2FC99A Registered Machine
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/( )\ Shrewsbury, New Jersey http://counter.li.org
^^-^^ 12:20:01 up 2 days, 18:54, 3 users, load average:
4.27, 4.50, 4.58
Kodak does indeed have some magic in encapsulating the
ingredients so that they can get away with packaging D-76
and Dektol as single packages. However, in the past both
came as double packages with the metol separated.
Metol does not dissolve well in sodium sulfite solution
so it should be put up separately. AFAIK, the other
ingredients can be combined.
Ansco used to sell packaged 47 so its doable.
BTW, Ansco/Agfa 47 appears to be essentially identical
to Kodak D-61a except for strength. The ingredients of the
Kodak formula are double those of the Ansco formula.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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