Re: Pd with dichromate contrast control
Thanks for pointing that out, Mark; somehow I missed it entirely. Too obvious, I guess. :) However, the book only talks about sodium dichromate. I've heard potassium dichromate mentioned here before (was that you Sandy?). Am I just imagining the use of ammonium dichromate? I thought someone mentioned it in the Ware/Malde POP discussion (the search function of the recent archives is down at the moment, so I can't verify it). Camden Hardy camden[at]hardyphotography[dot]net http://www.hardyphotography.net On Thu, December 14, 2006 10:35 am, Ender100@aol.com wrote: > Camden, > > Dick has such a conversion chart in the second edition of his book. > > Best Wishes, > Mark Nelson > > Precision Digital Negatives - The System > PDNPrint Forum at Yahoo Groups > www.MarkINelsonPhoto.com > > > In a message dated 12/14/06 11:22:46 AM, camden@hardyphotography.net > writes: > > >> I've been using the Dick Arentz method of pd contrast control with >> various >> concentrations of the Na2 solution. I'd like to try printing pure >> palladium with ammonium dichromate for contrast control, as I've heard >> someone mention in the past. >> >> So my question is, how does one method translate to the other? What >> kinds >> of quantities/dilutions of am. dichromate would I need to use to get >> comparable contrast results to Arentz's 1s/2s/3s solutions? I realize >> this is an apples/oranges question before asking it, but I'm having >> trouble finding a better analogy. :) >> >> >> Thanks, >> Camden Hardy >> > > > > > > > > > >
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