RE: Pd with dichromate contrast control

[EJN Photo <ejnphoto@sbcglobal.net>]

Camden, I use a 1% solution of dichromate when adding it directly to the
solution. I don't have a conversion for you. I am not that keen on beating
down the step scale to make charts. 

I have one bucket of 5ml/liter Pox Ox and for additional change, make it to
the coating solution. 

Eric

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com


 
Skype : ejprinter> -----Original Message-----
> From: Camden Hardy [mailto:camden@hardyphotography.net]
> Sent: Thursday, December 14, 2006 1:14 PM
> To: alt-photo-process-l@usask.ca
> Subject: Re: Pd with dichromate contrast control
> 
> Thanks, Sandy.  That's a starting point, at least.  I'll play
> around with
> it and see what I can come up with.
> 
> Camden Hardy
> 
> camden[at]hardyphotography[dot]net
> http://www.hardyphotography.net
> 
> 
> 
> On Thu, December 14, 2006 12:01 pm, Sandy King wrote:
> > Hi Camden,
> >
> > No, I could not tell you how much to add, but it would be a
> very
> > small amount. If I were gong to test this I would try a 1% AD
> > solution and see what would happen with 6-6-1 rate (6 drops
> FO + 6
> > drops PC + 1 drop of the 1% AD solution. But I could be way
> off on
> > this. I know that adding one drop of a 5% solution of 2ml of
> combined
> > FO+PC has a very significant impact on contrast.
> >
> > Sandy
> >
> >
> >
> >
> >
> > At 11:08 AM -0700 12/14/06, Camden Hardy wrote:
> >>Sandy,
> >>
> >>Thanks for the information; that was just what I was
> wondering about.
> >>I've got a surplus of ammonium dichromate that I've been
> looking to use
> >>up.
> >>
> >>Just out of curiosity, do you have any estimates as to what
> ratio of 5%
> >>dichromate I would have to add to my sensitizer (instead of
> the
> >> developer)
> >>to get roughly a 2s mix?
> >>
> >>Camden Hardy
> >>
> >>camden[at]hardyphotography[dot]net
> >>http://www.hardyphotography.net
> >>
> >>
> >>
> >>On Thu, December 14, 2006 10:58 am, Sandy King wrote:
> >>>  Camden,
> >>>
> >>>  Any of the dichromates can be used, and when used at the
> same
> >>>  percentage solution will give similar results. I don't
> recommend
> >>>  sodium dichromate for most applications because of its
> deliquescence,
> >>>  and its greater solubility offers no advantage in this
> application so
> >>>  far as I can see.
> >>>
> >>>  Sandy
> >>>
> >>>
> >>>
> >>>  At 10:50 AM -0700 12/14/06, Camden Hardy wrote:
> >>>>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
> >>>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>
> >>>
> >
> >