If you consider D76 for example, after adding 100g of NaSulfite to the water, I
don't think the initial hardness of any water would be critical. Just
considering the ratios. However, if your water has an extremely high iron
content, I could imagine that it could have an effect perhaps on storage. But
again, I've never seen any studies done perhaps because the impurities in tap
water is usually low..
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________________________________
From: pure-silver-bounce@xxxxxxxxxxxxx <pure-silver-bounce@xxxxxxxxxxxxx> on
behalf of Dana Myers <dana.myers@xxxxxxxxx>
Sent: Wednesday, July 28, 2021 10:02:40 AM
To: pure-silver@xxxxxxxxxxxxx <pure-silver@xxxxxxxxxxxxx>
Subject: [pure-silver] Re: HC-110
On 7/27/2021 8:17 PM, Garry . wrote:
I know many may disagree. But I'll just relay some experiences I had. I worked
at a lab that had a number of different water processing setups.
So I brought some deionized triple filtered water home and used that to mix
developer. The results were terrible.
So I then brought home some reverse osmosis water and mixed some developer. The
results were terrible.
I brought home distilled water that I knew was really distilled and tested for
dissolved solids. The results were good.
I used filtered tap water and mixed developer and it matched the distilled
water results.
Now I'm aware of all the differences between the different purification
methods, and why some may not work as well as others, but I've been using tap
water ever since and I've checked the ppm of the tap water as reported by the
water company and contaminates are all very low. I asked some film processing
companies what water source they used and they all said tap water, filtered of
course.
In fact, as i was mixing the replacement batch of Xtol stock, I recalled
discussions like
this on this list, and pondered the idea of adding some less-filtered tap water
(since
the ZeroWater cistern uses a filter, it's technically just filtered tap water,
right?).
My water hardness is ~180-200 ppm TDS, which is to say, hard. I considered
adding
enough carbon-filtered tap water to bring the TDS up to ~30, which is typical
of bottled
water that I've checked. Give the sequestering agents in the developer some
minerals
to work with, right?
However, this is the first time I recall seeing this problem in decades (though
I did used to
buy distilled water at the store rather than use ZeroWater, I've been using
ZeroWater for
several years) so I concluded the issue is likely elsewhere and did not change
this variable.
Dana K6JQ
