[pure-silver] Re: Kodak Special PX 3001paper
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 25 Mar 2008 15:46:46 +0100
Richard,
Ron Mowry on APUG mentioned:
Cadmium had one major purpose in paper emulsions. It controlled the toe
contrast (and to some extent the shoulder). Thats about it. Other
chemicals in the emulsion controlled the tone of the developed silver.
Examples of the latter were Lead, Copper, Mercury salts and organic
compounds such as benzotriazole.
PE
In a looooong thread, see:
http://www.apug.org/forums/forum37/38320-legendary-qualities-discontinue
d-papers.html
Best,
Cor
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
> Sent: dinsdag 25 maart 2008 2:21
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: Kodak Special PX 3001paper
>
> At 01:43 PM 3/24/2008, you wrote:
> >PX just means experimental. FX is "film experiment" PX is "paper
> >experiment". The 3001 just means that was the next number
> >available from corporate for test projects. It is a more recent
> >number. Open the box (in total dark, no safelights) and see if there
> >is a stuffer sheet inside. It will tell you how to process the
> >paper and hopefully how to expose it. I don't remember if 3001 was
> >one of mine or not.
> >
> >Dave
>
> Here is a question maybe you can answer. There has been mention
> that cadmium was used as an additive to paper for a long time and
> that it had to be removed due to its being an environmental hazard.
> What was it used for exactly? Some literature suggests it was a
> preservative and some a warm tone agent, perhaps it was both. In any
> case it has been suggested that one reason the shelf life of current
> papers seems to be shorter than some in the past is due to the lack
> of cadmium.
>
>
>
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
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