[pure-silver] Re: HC-110

  • From: Dana Myers <dana.myers@xxxxxxxxx>
  • To: pure-silver@xxxxxxxxxxxxx
  • Date: Wed, 28 Jul 2021 07:02:40 -0700

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

Other related posts:

  1. Home
  2. pure-silver
  3. Archive
  4. 07-2021