[pure-silver] Re: Acid Stop and FB was " RC to FB"

According to 'Post Development Processing' by Dr. Michael J. Gudzinowicz the
following are the recommended levels for commercial and archival processing:

                        Commercial                    Archival
Bath 1:
Max. Ag conc.:          2 g/l                         0.8 g/l
Bath 2:
Max. Ag conc.:          0.3 g/l                       0.05 g/l

Non-image Ag in paper: 0.005 mg/in^2 0


In his paper Gudzinowicz makes reference to other research done by Grant
Haist, the former director of research at Kodak, who cites the following
maximal permissible values for one-bath paper fixers:
 
                        Commercial                    Archival
Paper:
Max. Ag conc.:          0.3 g/l                       0.05 g/l
 
Non-image Ag in paper: 0.005 mg/in^2 0






Regards



Ralph W. Lambrecht




On 12/31/04 10:44 PM, "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx> wrote:

> From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
> Subject: [pure-silver] Re: Acid Stop and FB was " RC to FB"
> Date: Fri, 31 Dec 2004 21:05:38 +0100
> 
>> Sounds reasonable, but I don't do it, because I change the 1st fixing bath
>> as soon as silver levels have reached 0.8 g/l anyway.
> 
> Why? That's about half square meter of print per liter, right?
> 
> If you are doing two stage fixation, you should be able to use a lot
> more than that.
> 
> --
> Ryuji Suzuki
> "Keep a good head and always carry a light camera."
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