[pure-silver] Re: storing developer solutions (was Re: Re: HC 110 question ...)

They also work as pillows on canoe trips down the river. The first stop
however, does require you to drink a little : ) With a small group a small
bag/box wine can go quickly. 

And yes, I do use those in my darkroom or something like them, for many
solutions. I should have said that bottles have been used more for diluted
solution that may be used over the next few days, and the bags are mostly
what I use for long term storage. 


Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of David Foy
> Sent: Tuesday, May 30, 2006 1:56 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] storing developer solutions (was Re: Re:
> HC 110 question ...)
> 
> Winemaking stores sell high-barrier Mylar "bags" meant to hold
> home-made
> wine. They're the same bags used in the bag-in-a-box "box
> wines."
> 
> I realize that no-one on this list has ever sunk to the depths
> of
> drinking the kinds of wines that come in boxes, so I probably
> should
> explain in considerable depth exactly what these are...
> but what with the pressures of time etc etc, I must defer to
> another
> day...also let me make it clear that *I* have had no personal
> experience
> with these so-called "wines." Yuk.
> 
> These bags work exceptionally well. You can exclude all of the
> air, and
> because they are a laminate of high-density polyester and metal
> foil,
> their gas permeability is extremely low, much lower than any
> plastic
> bottle with the possible exception of rigid PET. I base this
> statement
> on what the manufacturers say about the laminate material, and
> what
> bottle manufacturers say about PET and HDPE. It's all
> googleable for the
> curious.
> 
> I store 5-litre quantities of my own Bluefire HR developer
> concentrate
> in them between bottling runs. Longevity tests indicate zero
> loss of
> activity in nearly two years (same with full, capped rigid PET
> bottles),
> versus an insignificant yet measurable loss associated with
> full, capped
> HDPE. I use them to store HC-110 stock for months at a time,
> and have
> not yet seen any obvious oxygen problems.
> 
> They're very inexpensive, something like $4 for a 5-litre bag.
> They're
> very easy to wash and re-use.
> 
> David Foy
> 
> Koch, Gerald wrote:
> > Bottles that are soft enough to squeeze may not be the best
> to use since
> > they may allow oxygen to diffuse into the contents.  The
> accordian style
> > sold in photo stores are particularly bad in this respect.
> PET or PETE
> > bottles while more rigid and not really squeezable are
> probably a better
> > choice.
> ...
> 
> > quoting someone: Which is why it goes in a bottle you can
> squeeze the air out of to keep
> > it fresh(er).
> >
> ...
> >
> ...
> >> who quoted someone else: The diluted stock solution has
> limited keeping properties while the
> >> concentrate is eternal.  I forget Kodak's recomendation, 3
> >> months for
> >> partially filled bottles?
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