[pure-silver] Re: Adding Pot Bromife to PC-TEA
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 07 Jan 2005 16:37:58 -0500 (EST)
From: Jordan Wosnick <jwosnick@xxxxxxxxxxx>
Subject: [pure-silver] Re: Adding Pot Bromife to PC-TEA
Date: Fri, 07 Jan 2005 15:45:37 -0500
> The importance lies in the fact that ascorbate oxidizes more
> quickly that ascorbic acid. This can affect keeping properties.
I also wanted to point out somewhere before but lost chance.
So I'll reply here.
Using glycols as the solvent for stock solutions may prolong the shelf
life of ascorbate developers, but it offers nothing to alleviate other
problems that are sporadically reported. The sudden death without
color change. No one really knows what causes it, but I strongly
suspect that it is related to redox catalysis by minute amount of
impurities from chemical stocks, water supply, and stuff that comes
out of the film, reels, tanks, apparatuses, etc.
We shouldn't forget about this problem.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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