[rollei_list] Re: [rolleiusers] Argomania
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 14 Jan 2010 18:32:27 -0800
----- Original Message -----
From: "Laurence Cuffe" <cuffe@xxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, January 14, 2010 12:42 PM
Subject: [rollei_list] Re: [rolleiusers] Argomania
Other weird thing: cadmium.
Laurence Cuffe
I am not quite sure what properties cadmium adds to
emulsions but it, or cadmium compounds, were added to both
paper and film emulsions until the use of cadmium became too
difficult due to environmental protection restrictions.
Cadmium and mercury are generally considered dangerous to
the environment. Cadmium was very widely used in industry
for many decades, it was commonly used to plate metals to
provide protection from oxidation and as a base for paint.
Cadmium was also used in paints as a yellow pigment. I have
heard that it was a component in warm tone emulsions and
also that it had preservative action in emulsion lengthening
the shelf life but I have no substantiation of either. While
its possible to argue that the shelf life of film and paper
which do not contain cadmium is shorter than those which do
again I have no substantiation.
If anyone ever tried to corner the market in cadmium its
news to me.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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