RE: palladium bleedoff

Chris, Several issues to look at...

Soak in time, amount of coating solution, RH of paper and in coating room.
Soak the solution into the paper until longer soaking gives grainy look of
paper, reduce solution volume until blacks get weak or TOO hard to coat
evenly, humidify paper to help blend solution volume and soak in time,

Also process upside down ( coated side down ) and rotate print in print
washer. Also be careful not to over soft paper with excessive EDTA/clearing
bath.

Eric, still on the road, Neilsen

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
 
Skype : ejprinter
> -----Original Message-----
> From: Don Bryant [mailto:dstevenbryant@mindspring.com]
> Sent: Monday, July 10, 2006 5:24 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: palladium bleedoff
>
> There was a long thread about this topic back in May on the
> APUG Alternative
> Process Forum.
>
> http://www.apug.org/forums/showthread.php?postid=310901
>
> Some folks mentioned that they have had the problem occur with
> several
> different types of paper including Platine, Cot320, Cranes
> Cover 90 (a.k.a.
> Birdcageotype in Placerville, CA) and possibly others. In the
> end, nothing
> definitive was resolved as the exact cause of this problem.
>
> I've also experienced this problem with iron-silver processes
> such as VDB
> and kallitype using different papers at various RHs.
>
> My best guess is that the amount of sensitizer used can cause
> this,
> specifically using more than is really needed. I've also
> noticed that this
> problem will crop up when printing negatives that have a lot of
> dark tones
> near the edge of the image but the bleeding can be observed in
> any part of
> the image where darker tones occur.
>
> I inquired about this problem quite a while ago when printing
> VDB. So far as
> I know no one has solved the issue.
>
> I do recall that Mike Ware discusses a similar issue of
> bleeding using the
> traditional cyanotype formula in his cyanotype book. If memory
> serves me
> well he referred to this as peptization (peptisation) but may
> not be related
> to palladium printing.
>
> Don Bryant
>
>
> -----Original Message-----
> From: Christina Z. Anderson [mailto:zphoto@montana.net]
> Sent: Monday, July 10, 2006 10:36 AM
> To: Alt, List
> Subject: palladium bleedoff
>
> Hi All,
> Back from assisting the Bruce Barnbaum workshop at the
> Photographer's
> Formulary. What a hoot. Great sense of humor, that guy, and
> all of a
> sudden my black and white prints don't look so stellar to me
> anymore :)
>
> Back to alt this week: I've never seen this issue until this
> month,
> although I have read about it on the list and kept notes as to
> its causes
> (don't use Crane's Cover bright white, too rapid drying, too
> much metal
> salts...). So this month I've been making prints my exact
> normal way, on
> the same paper (Arches Platine), everything. The bleeding is
> only coming
> from the dark border edges of the print and is not affecting
> the image
> density at all.
>
> The only thing that may be different in my practice is the
> humidity is
> higher here in the summer--all of 42% (and once I saw it at
> like 50%!)
> instead of 20-35%! Except that should be a plus for this
> problem, not a
> minus. I do let the print dry for 20-30 minutes, air dry.
>
> And I did a perhaps no-no: I was running out of am citrate
> developer so I
> had a jar of sod citrate on hand and mixed up that and mixed it
> into the am
> citrate. Could that be the problem, the two citrates mixed?
> Otherwise am
> citrate does great for me.
>
> What is even the difference between an ammonium and a sodium
> salt of a
> substance?
>
> Does anyone mix Tween in with their sensitizer? I know Michael
> Kravit mixes
>
> PVA 10% goo, 2 drops into 5ml...
>
> The last possible idea is that my former palladium solution--
> purchased--had
> less metal salts in it than my current palladium solution which
> I mixed
> myself...but that shouldn't be the case, correct? I mean,
> isn't all
> palladium mixed at the same strength (5g to 55ml)? I sure am
> getting nice
> blacks, though!
>
> Too many questions I am sure...but it's ohhhh so fun when you
> pt/pd guys
> start talking.
> Chris
>
>
Received on 07/10/06-07:07:28 PM Z