[pure-silver] Re: prepackaging my developer
- From: Jean-David Beyer <jeandavid8@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 09 Nov 2009 12:29:13 -0500
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.
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