[pure-silver] Re: Kodak Wash Aid Patent
- From: Lloyd Erlick <lloyd@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 18 Apr 2007 13:35:18 -0400
At 06:41 PM 4/16/2007 , >Richard Knoppow wrote:
...
> The patent states that the sequestering agent or agents
>are there to prevent precipitation the sulfite by calcium or
>magnesium salts in water or carried over alum hardner.
>Citric acid is a good sequestering agent as is the EDTA.
>Probably both are used in the commercial products because
>one may be more effective for certain salts than the other.
>
>---
>Richard Knoppow
>Los Angeles, CA, USA
>dickburk@xxxxxxxxxxxxx
>
>====================
April 18, 2007, from Lloyd Erlick,
Sequestering agents are unnecessary if fixer is prepared with distilled
water. (I haven't used hardener for decades ...).
I find the fixer Ansel Adams calls 'plain fixer' just right. Two
ingredients (well, three if you count water). Cheap and quick to mix. (If I
recall, the formula is in the appendix of The Print.)
regards,
--le
________________________________
Lloyd Erlick Portraits, Toronto.
website: www.heylloyd.com
telephone: 416-686-0326
email: portrait@xxxxxxxxxxxx
________________________________
--
=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your
account (the same e-mail address and password you set-up when you subscribed,)
and unsubscribe from there.
Other related posts:
