From: Clay (wcharmon@wt.net)
Date: 12/31/02-08:54:24 AM Z
Carl:
Have you ever tried the di-sodium EDTA first clearing bath that Ware
recommends? I've been using it for about a year, and its acidity seems
to make the first bath do most of the 'heavy lifting', and the next two
HCA baths last a lot longer. It has an acidic pH, and according to
Ware, clears the unused ferric from the paper more efficiently than the
basic pH of HCA. Artrcraft sells the stuff along with the normal
tetra-sodium version. Citric probably is achieving the same thing.
Clay
On Tuesday, December 31, 2002, at 08:51 AM, Carl Weese wrote:
> Linas,
>
> Just catching this thread, which has been pretty well covered.
>
> Except, Lenox too is variable. After using it as one of my two main
> papers
> for a couple of years now, my most recent batch might as well be
> another
> paper. It's whiter, (not necessarily bad) smoother, (ditto), but
> requires a
> lot more solution to coat (bad) and pure palladium prints come out
> bright
> pink (very, very, bad) instead of the beautiful mahogany color I'd been
> getting. It's still useable if given an oxalic acid presoak and coated
> with
> a 25% platinum mixture, but I'd really like the old stuff back again.
>
> On clearing, what strength are you using the citric? I've found that
> Lenox
> and some other papers I use clear *almost* (but never fully)
> completely in a
> weak (1 tblsp. per liter, which is very roughly 2%) citric acid bath
> after
> ten minutes or so, and then finish clearing, *blam!* when moved to a
> second
> bath of EDTA/sulfite. The citric turns color very quickly, as in one
> 8x10
> per quart. Since you are a chemist and I'm not, I'm curious whether
> this
> makes technical sense as a clearing regimen, and also how to judge the
> capacity of the baths--throw them out when they show the slightest
> signs of
> discoloration, or keep them till they look like a substance
> much-discussed
> of late on the list, or perhaps somewhere in between?
>
> ---Carl
>
> --
> web site with picture galleries
> and workshop information at:
>
> http://home.earthlink.net/~cweese/
>
> ----------
>> From: Linas Kudzma <lkudzma@earthlink.net>
>> To: alt-photo-process-l@sask.usask.ca
>> Subject: Re: Papers for Platinum Printing
>> Date: Tue, Dec 31, 2002, 3:18 AM
>>
>
>> Sandy,
>> My current favorite is Lenox. Nice slightly textured surface, shows
>> fine
>> details, coats easily and clears rapidly in warm citric acid
>> solution. Lenox
>> gives slightly higher contrast than Cranes Cover.
>>
>> Until very recently, Cranes Cover Natural White Wove was my standard.
>> However, my most recent batch from Cranes was clearly a different
>> paper.
>> Very disappointing! This latest batch is identically smooth on both
>> sides
>> (not the case before) and prints with consideraly higher contrast and
>> longer
>> print times than 4 other lots I've bought.
>>
>> Linas Kudzma
>>
>>
>> ----- Original Message -----
>> From: "Sandy King" <sanking@clemson.edu>
>> To: <alt-photo-process-l@sask.usask.ca>
>> Sent: Monday, December 30, 2002 11:33 AM
>> Subject: Papers for Platinum Printing
>>
>>
>>> I would be interested in hearing the opinions of platinum printers
>>> regarding what they consider to be the best papers when the main
>>> criteria are, 1) shows fine detail, and 2) clears easily. And I mean
>>> papers used out of the package, i.e, with no additional sizing!
>>>
>>> Sandy King
>>>
>>
>>
>
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