[alt-photo] Re: Weston Diploma Parchment

[EJ Photo]

I haven't seen heat fog with that paper. It could very well be an issue with
Ferric but replacing is NOT always needed. It could very well be that
repairing it is in order. It could be a pH issue or all sorts of stuff. Try
adding some more Oxalic acid to your ferric. Hair dryers should only be used
lightly and primarily on the backside with low heat. 


I'd suspect the light bleed along the negative material; light piping. Try
place the mask under it just for a test and see if it stops it. If you can't
get it to stop, clear, or prevent the distraction of the fog, just coat the
whole piece of paper. ; ) 

have you tried a fresh batch of developer? Is it possible that you were
playing around with it and had some lithium in the mix?  or gold that is
fogging it? 
  
Eric

Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
 
www.ericneilsenphotography.com
skype me with ejprinter
www.ericneilsenphotography.com/forum1
Let's Talk Photography
 
-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Diana Bloomfield
Sent: Monday, March 08, 2010 7:27 AM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: Weston Diploma Parchment

Jon,

Have you printed any of these without using a hair dryer beforehand?   
I'm thinking your problem might be either exhausted ferric oxalate,   
and/or use of the hair dryer-- as well as allowing it to sit for an  
additional 15 minutes after using the hair dryer(?).  I taught a  
workshop once where there was some evidence of fogging, but only for  
those people using hair dryers-- even when they set it on a "cool"  
setting.  When we eliminated the use of hair dryers, the problem  
disappeared.   Just a suggestion, but it's worth a try to switch to  
fresh ferric oxalate and skip the hair dryer.  I also think certain  
papers are really a disaster for pt/pd.  I used to use, many years,  
ago Cranes Platinotype (sp?), and I couldn't completely clear a print  
on that paper to save my life-- no matter what I used..  I never liked  
the Weston paper, either, but I know I'm in the minority there.  I  
just don't like the weight of it.

Diana


On Mar 8, 2010, at 5:25 AM, Jon Reid wrote:

> Hi all,
>
> I have been battling a problem for about 6 months now. At first I  
> thought it was a clearing problem then after trying various things  
> realised that it wasn't clearing but rather some density that was  
> appearing in the coated area of the paper that is masked during  
> exposure. The paper that I have been trying to print on is Weston  
> Diploma Parchment. I bought this paper in early 2008 from Bostick &  
> Sullivan and believe it is stock that was made by Cranes, not the re- 
> invented Diploma Parchment Plat Pal being marketed by John Zowkowski  
> of Butler Dearden.
>
> I am wishing to print my 5x7 rollo-pyro negs on these 11x14 sheets  
> for my debut solo exhibition. I do not want to mat the prints so I  
> am trying for very clear coated-but-masked areas. The other night,  
> believing I was dealing with a fogging issue I set up darkroom  
> safelights and coated under those lights. I then used a hair dryer   
> and rested the paper in the room for 10-15min before exposure (11min  
> in my UV box), and developed in KOx (cold bath version-fresh) at 21C.
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