U of S | Mailing List Archive | alt-photo-process-l | RE: pH question

RE: pH question

  • To: alt-photo-process-l@usask.ca
  • Subject: RE: pH question
  • From: EJN Photo <ejnphoto@sbcglobal.net>
  • Date: Tue, 20 Mar 2007 13:41:03 -0500
  • Comments: "alt-photo-process mailing list"
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Bob, I'd go with Don on this. Nadeau recommends that it be kept acid; below
7. He doesn't give a low end. I don't seem to be able to lay my hand on
Stevens Kallitype book right now, but If I do, I let you know. One way to do
it without a reference would be to check it now and again, and track the
changes. When it is at or close to 7 add citric acid to reduce it to 6. Make
a print and see how it looks, then make an additional drop in pH perhaps to
5.5 and see what happens with an additional test print/wedge. I believe it
is just that it likes acid environment, but no need to get it too low.  

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
Skype : ejprinter> -----Original Message-----
> From: BOB KISS [mailto:bobkiss@caribsurf.com]
> Sent: Tuesday, March 20, 2007 12:06 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: pH question
> Anyone???
> 		BOB
> -----Original Message-----
> From: BOB KISS [mailto:bobkiss@caribsurf.com]
> Sent: Tuesday, March 20, 2007 9:17 AM
> To: alt-photo-process-l@usask.ca
> Subject: pH question
> 	At what pH should I keep my Potassium Citrate developer for
> pt/pd?
> 	Eric Neilson suggested that I keep my Pot Ox dev at between
> 5 and
> 5.5 with small additions of oxalic acid when necessary.  I can
> add small
> amounts of citric acid to my Pot Cit dev but I am hoping to
> know what the
> best aim pH is for best development.
> 	Thanks in advance...
> 			BOB
>  Please check my website: http://www.bobkiss.com/
> "Live as if you are going to die tomorrow.  Learn as if you are
> going to
> live forever".  Mahatma Gandhi