RE: Stain in Pt./Pd. printing, was Re: price of pt/pd printing

Well, it may be possible to have a gray stain that is not fogged but I have
never seen it. Gray to me says solid metal has formed. You may be able to
"bleach" that off but I'd hesitate to call that stain. Heat fog can be
caused by your drying technique or light box. Besides light fog and heat
fog, there is chemical fogging. Chemical fog can be caused by either your
coating solution or your developer and developing techniques. If you
humidify too long with some mixes (lithium comes to mind) chemical fogging
of your paper can happen. Your developer will build up waste; buffer, iron
(ferrous and ferric), paper fiber, metal. These should be filtered and
adjusted for on a regular basis to avoid a slow build up that "appears" out
of nowhere. As Sandy suggest, replenish your developer. You may also check
the sp gr of it every once in a while. Water will absorb in to the paper
and get carried away.

Maybe just trying a new fresh bottle of developer is in order. Are you
trying to get cooler more neutral prints with ammonium citrate? How about
just using ammonium palladium with Potassium Oxalate?

Chris, are you going directly into a clearing solution or water rinse first?

Sounds like it may be time for Uni 40's to the rescue. If you have all your
glass at least you can hang your show. Then when your fames come in you can
just hang them empty; like the blank canvas idea. : )

Good luck on it all.
EJ Neilsen

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
 

> -----Original Message-----
> From: Sandy King [mailto:sanking@CLEMSON.EDU]
> Sent: Tuesday, April 12, 2005 10:30 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Stain in Pt./Pd. printing, was Re: price of pt/pd printing
>
> Chris,
>
> Are you replenishing the ammonium citrate developer after each use? I
> have not used ammonium citrate but with sodium citrate I have found
> that if you don't replenish the developer on a consistent basis your
> will start to get stain from iron hydroxide, which is very difficult
> if not impossible to completely clear.
>
> Another thing to check would be the pH of your developer. If for any
> reason it is on the base rather than acidic side my experience has
> been that iron hydroxide stain is very likely to happen.
>
> Based on the description of your working procedures I don't believe
> there is much chance at all that you are getting stain from the light
> box getting too hot. And you have a fan in the box, right?
>
>
> Sandy
>
>
>
>
>
> >>I do find it hard to believe that you are getting faint gray with 1 drop
> of
> >>5% boost? Are you exposure long? Or is your light box getting hot?
> >>Eric Neilsen Photography
> >
> ><Jeffrey Mathias said, snip from other post>
> >It would be true the yellow is likely not cleared.
> >However, not cleared can also look light gray. So, gray does not mean
> >exclusively that it has been fogged
> >
> >Eric and Jeffrey,
> >My exposures are 5 minutes, UVBL, and I use ammonium citrate
> >developer, and a clear of a heaping TB citric and EDTA-di per liter.
> >I use a totally colorized neg, with a "manufactured" border in
> >Photoshop of solid color. I have not tried a black ink only
> >border...
> >Light box is not getting hot. The grey is very faint, almost
> >imperceptible. If it is a clearing problem, is my clear of choice
> >not good? How many prints, for instance, do you all get from a
> >liter of clear? I've done 16 4x6's in a gallon, 3 trays 5 min each,
> >dump the first when it gets yellowed, and now dumped the whole
> >gallon.
> >You know, I bet I could test the clear issue if I put the print
> >outside in bright sun, would it expose and darken? Or could I
> >reclear the prints at this stage after they have been done a week?
> >So many questions, so little time, and I really should be
> >concentrating on the fact that my 33 20x24 frames I ordered from
> >Jerry's Artarama for my thesis show which haven't come are, in fact,
> >backordered, and they neglected to tell me in 3 calls to them until
> >last night and I need to hang this weekend....when it rains it pours.
> >Chris
Received on Tue Apr 12 10:53:34 2005