Pt / Pd developers


#1

Walker or Jon,

In researching the effect(s) on print “warmth” (using Pd only) from different developers (at different temperatures) on different papers I found the Cone Editions page (https://cone-editions.com/platinum/proofs/) that describes your simulated proofing print service. Can you tell me what “cold oxalate” developer is? Is it KO used at a temperature below room temperature? And if so what temperature? Or is it “cold-bath” developer, i.e. KO modified with potassium phosphate monobasic?

thanks!

Michael


#2

we really should say room temperature… we meant cold as opposed to HOT! And everyone has a different view of HOT. I learned with hot PO that can burn you to death. Others go no more than 140. I’ve never actually tried chilling PO down to see what happens…

 


#3

Hi Jon,

Thanks for the quick reply. That makes more sense, :-). Keith and I ran some different developers tests (under different temps) with everything else being equal to see the effect on print warmth. The results are quite subtle and sometimes can only be discerned by A/B comparisons (our brains are terrible at absolutes)!


#4

I agree that hot, cold, and “room temperature” are too non-specific to be meaningful terminology though they are commonly used. We should specify actual temp instead with an understanding that in may be plus or minus a couple of degrees. My “hot” PO temp is 120F. Room temp varies with the season!


#5

Hi,

I am trying to find the “Datasheets” for the Pt/Pd darkroom procedure used when the curves we’re created. I don’t see readme files in the curves folders?

 

Thanks Robert

 


#6

These data sheets were mis-leading and should be edited out of the various references and then explained in a more general way in the 2018 edition of the Deluxe Manual shortly.

In general this is the curve name schema:

PiezoDN-80pd20pt-AC.quad
This was a curve we built for 80% palladium and 20% platinum developed in ammonium citrate. Results WILL vary from darkroom to darkroom so the particulars are not very useful here and this curve will possibly be edited out of upcoming releases.

PiezoDN-80pd20pt-Ox.quad
This was a curve we built for 80% palladium and 20% platinum developed in ammonium citrate.
Results WILL vary from darkroom to darkroom so the particulars are not very useful here and this curve will possibly be edited out of upcoming releases.

PiezoDN-Cyanotype.quad
This is a curve we built for the OLD type of cyanotype chemistry (not Mike Ware’s new style). We’ll most likely publish a second “NewCyanotyope” curve in future.

PiezoDN-Master.quad
This is for Palladium in Oxalate developer at room temp. It is our standard “Platinum/Palladium” starter curve.

PiezoDN-Pd-AC-IJM.quad
100% Palladium in AC developer. I think it’s redundant to the master.

PiezoDN-Pd-Ox-IJM.quad
This is the same as the master. Redundant.

PiezoDN-SaltThiorea.quad
This is a curve that is denser and is built as the starter curve for Salt printing (POP) process.

PiezoDN-Silver.quad
This is for #2 filter, Ilford MV IV paper, Sprint Developer.

PiezoDN-Ziatype.quad
This is a starting curve for the Ziatype process.