From: Carl Weese (cweese@earthlink.net)
Date: 09/24/03-02:10:52 PM Z
Sam,
Perhaps a resident chemist will have better information on this, but my
impression is that kind of processing a Pt/Pd print goes through should
pretty much remove any additives in the paper, leaving nothing but cellulose
and embedded metal particles. Kalli and Van Dyke should be similar. For gum,
I'd think the soak times ought to be removing sizing and other chemicals
along with the dichromate.
So I think there's more worry about the chemical additives in paper changing
while it's in storage waiting to be printed than the finished prints
changing over time from leftover impurities.---Carl
--
Web site with picture galleries
and workshop information
http://www.carlweese.com
> From: Sam Wang <stwang1@bellsouth.net>
> Reply-To: alt-photo-process-l@sask.usask.ca
> Date: Wed, 24 Sep 2003 15:36:46 -0400
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: RE: old Cranes paper gone bad WAS RE: Van Dykes
>
> Darryl,
>
> These were mostly stored in metal file drawers.
>
> I did notice that the Arches papers were slightly discolored (to a tan) at the
> exposed
> edges in addition to losing sizing.
>
> What I wonder is how inert are the papers we use. If they change in property
> in storage
> BEFORE use, would they not also do so afterwards?
>
> (So Darryl, the dilemma may be: to use them before they change, or see them
> change
> after being printed. Yikes!)
>
> Sam
>
>
>> From: "Baird, Darryl" <dbaird@umflint.edu>
>> Date: 2003/09/24 Wed PM 03:09:17 EDT
>> To: alt-photo-process-l@sask.usask.ca
>> Subject: RE: old Cranes paper gone bad WAS RE: Van Dykes
>>
>> Sam, sorta interesting (and distressing news since I am storing some
>> vast quantities of several papers bought with a grant). Were these
>> stored in metal or wooden cabinets? I once had an alt-p. class that
>> used BFK for an entire semester. As we got closer to the bottom of the
>> paper stack (and the end of the semester) several students previously
>> good images failed to get the same contrast or clear highlights. We
>> looked for causes and finally assumed the unpainted wooden shelf was
>> leaching formaldehyde or whatever was used to make the plywood. I now
>> use either a good barrier layer of acid free paper or plastic sheets
>> to stack paper onto.
>>
>> My oldest paper is only three years old, still a toddler.
>>
>> Darryl
>
>
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