[pure-silver] Re: stopbath kills fixer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 25 Jan 2005 17:27:57 -0800
----- Original Message -----
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, January 25, 2005 1:42 PM
Subject: [pure-silver] Re: stopbath kills fixer
> Modern emulsions don't need hardener but the "traditional"
> or "silver rich"
> emulsions such as Forte, Foma, etc. still being produced
> could probably benefit
> from hardening fixers.
>
> Jerry
I wonder if these emulsions actually have any more silver
in them. Probably more than tabular grain emulsions because
tabular grains have better covering power than other shapes.
However, the hardness of the emulsion has nothing to do with
its silver content. Rather, it is an indication that the
manufacturers are ignoring decades of improvements in
emulsion making technology. Modern emulsions use different
hardening agents than those of sixty or seventy years ago
and also often contain synthetic polymers that make them
much less vulnerable to swelling from pH or heat. To say
something like this is no compliment to the films mentioned.
Rather it indicates a throw back to the days of poorer
technology.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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