RE: Help! Pt/Pd probs
A quick reply: Have you tried to print with very humid paper (to the point of being soft/limp) *by putting 2mil/50micron polyester under (to keep the paper humid for long exposure times) and over (to protect the negative) the sensitized paper*? Humid paper will be both softer and faster (in case of pd printing, w/ pt dry is faster)... ________________________________ From: Jon Reid [mailto:sharperstill@gmail.com] On Behalf Of Jon Reid Sent: Monday, July 06, 2009 4:34 PM To: alt-photo-process-l@usask.ca Subject: Help! Pt/Pd probs Hi all, Thanks to all for the advice re masking Pt/Pd prints last week. I printed again over the weekend and the Rubylith mask worked well. The edge is a little softer than I would like but I remember it is about the same as film edges used to print (before I printed from digital-internegs for a few years). Perhaps I am just used to the crisp edge of a digi-neg print. Another problem persists though. Remember I mentioned that my father had modified my contact printing frame so as to create more pressure because I suffered soft bands across the frame? Well, that modification definitely improved things, but I am still getting, even with incremental exposure, soft areas. I am printing 5"x7" pyro developed Tri-X in the middle of an 11"x14" piece of Cranes Weston Diploma Parchmont (old stock bought from Bostick + Sullivan, not the newer stuff from Butler Deardan). I finally decided I wanted to use this paper in this size for this series which I hope to exhibit. Salient points: 1) I've only ever printed Pt/Pd on Arches Platine before this and i've never had softness problems even before the frame modification. 1.5) The paper was buckling quite a lot when being coated. I reduced my drop count by a reasonable amount and am using 6 drops sensitiser, one drop contrast agent (NA2 or whatever it is) and 7 drops metals. 2) By incrementally building up the exposure (2mins exposure, lamps off for 1-2m; 2m exposure, lamps off etc) I can significantly reduce the corrugations that appear in the paper after the 10m exposure. I still think the problem is connected to paper weight and heat in my pizza oven. 3) I am resting the paper for a full ten minutes on a plastic rack over a tray of water after blow drying the sensitiser, and resting again for 5 minutes after exposure is complete. 4) I am centering the paper/neg etc in the printing frame. My last idea for remedying the problem is to place the paper sideways in the printing frame right underneath one of the springs. 5) I have to basically stop printing this series until I solve this problem as I simply cannot afford to keep printing otherwise perfect prints that have small soft patches on them. Any paper or Pt/Pd chemistry I need I must ship from the US and it is very expensive. I have a stack of ten or so that I must throw out that could otherwise be hung in the gallery. I'm getting desperate. I have upwards of 20 negs to print perfectly and more to shoot for my first solo show but it's hardly off to a great start.... It's late now... Thanks for listening, Jon
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