[pure-silver] Re: De-ionised versus distilled water for XTOL
- From: Claudio Bonavolta <claudio@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 05 Jan 2012 14:39:22 +0100
Not sure either if de-ionizing removes also metallic ions, probably not ...
Maybe a reverse osmosis is better in this aspect.
But I too use Cor's method of storage with Xtol and de-ionized water (the one
sold in stores for batteries or ironing).
Never had a failure and I get similar shelf life results (consistently >2years)
as Cor. With age, Xtol progressively turns yellow.
The only difference is that I develop by rotation, same dilution (1+1), but
with a much smaller stock quantity (100ml / 135-36 or equivalent).
For the birth of my daughter, I mixed a batch that I used for long-term shelf
life tests.
I stopped after 4 years with still successfull results.
As I still have a few bottles, end of March, I'll be able to run the 10 years
test.
I'd be very surprised by a positive result but who knows ...
Claudio Bonavolta
www.bonavolta.ch
----- Message d'origine -----
De: <C.Breukel@xxxxxxx>
Date: Thu, 5 Jan 2012 12:47:58 +0000
Sujet: [pure-silver] Re: De-ionised versus distilled water for XTOL
À: <pure-silver@xxxxxxxxxxxxx>
Hi Peter,
Cannot answer your question on de-ionised water, but I seem to recall that
Kodak puts chemicals in Xtol so mixing with less than pure (various tap
waters) water has no ill effect on the developer (I guess chelating agents such
as EDTA or so).
I mix up 5 litre and divide it over brown stoppered bottles, filled to the
brim. The left over I divide over smaller bottles; eithr 250ml stock (for 120)
or 150ml stock (35mm); these bottles I fill to the brim with distilled water,
and use it by enlarging the volume either 500ml or 300ml (Patterson, XTOL 1:1).
Storage in a cool dark basement. kept the stuff alive for 2+ years. Xtol
failures were mostly reported with the 1 litre package in the past as I recall.
Best,
Cor
------------------------------------------------------------------------------
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Badcock
Sent: donderdag 5 januari 2012 13:13
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] De-ionised versus distilled water for XTOL
Hi folks,
When I mix up my XTOL, I would like to start using water with less metals in it
(such as iron and copper) to give it the longest possible life. Apparently
sudden death is caused by the Fenton reaction which is catalysed by the
presence of those metals. Aside from not using up the 5L XTOL within 6 months
(I would need to develop at least 1 roll per week (@1+2 dil'n) to use it all
up in that time), and with Kodak on the verge of chapter 11 bankruptcy, I need
to make what I have last.
De-ionised water is cheaper and more readily available. So does the
de-ionising process remove metals such as iron and copper from the water ? I
can understand how distilling would remove the metal, but I'm unsure if the
resins used to de-ionise will remove metals (dissolved or not).
Up until now I have been using water filtered through a dual cartridge
undersink filter with "one granular activated carbon cartridge and one carbon
block cartridge."
thanks
Peter
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