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 09:31:03 2005