U of S | Mailing List Archive | alt-photo-process-l | RE: I SHALL NOT WANT...

RE: I SHALL NOT WANT...


  • To: alt-photo-process-l@usask.ca
  • Subject: RE: I SHALL NOT WANT...
  • From: Eric Neilsen <ejnphoto@sbcglobal.net>
  • Date: Sun, 18 Feb 2007 11:25:41 -0600
  • Comments: "alt-photo-process mailing list"
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Test, ignore

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
Skype ejprinter

> -----Original Message-----
> From: BOB KISS [mailto:bobkiss@caribsurf.com]
> Sent: Friday, February 16, 2007 8:49 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: I SHALL NOT WANT...
> 
> DEAR ROBERT,
> 	I bought them through a local (Barbados) importer named Agro
> Chemicals.  I don't know from whom they get them overseas.
> 		CHEERS!
> 			BOB
> 
> -----Original Message-----
> From: Robert Hall [mailto:Robert@Roberthall.com]
> Sent: Friday, February 16, 2007 7:10 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: I SHALL NOT WANT...
> 
> Bob,
> 
> >From whom did you purchase your chemicals?
> 
> Robert Hall
> www.RobertHall.com
> 
> -----Original Message-----
> From: BOB KISS [mailto:bobkiss@caribsurf.com]
> Sent: Friday, February 16, 2007 8:23 AM
> To: alt-photo-process-l@usask.ca
> Subject: I SHALL NOT WANT...
> 
> DEAR LIST,
> 	My kitty litter buckets runneth over!  At Eric's prodding I finally
> bought a 55 lb bag of oxalic acid and a 50 lb bag of potassium carbonate,
> the smallest quantities I could get over 1 lb at a time.  As they come in
> flimsy bags I am storing them in old but clean kitty litter buckets with
> tight lids.  Sooooooooooooo, I shall not want for Pot Ox PT/PD developer!
> 	However, here are some qualitative comparisons between paper (Cranes
> Platinotype) coated and exposed exactly the same but developed in my
> former
> favorite, sodium citrate dev, and the pot ox dev.
> 	Same neg, coating chem same, re-humidification process same, dev
> temp same 40 C, everything the same except the devs:
> 1) Pot ox gives more contrast.
> 2) Pot ox gives a little more speed.
> 3) Pot ox definitely gives a warmer print color.
> 4) Pot ox compresses the shadows, i.e. they go to a solid black with less
> separation even when highlight densities of prints in both devs match.
> *********Next, I will coat some paper, cut it into test strips, expose
> them
> in my Nu-arc with the same step tablet, process them identically except
> for
> the dev, read reflection densities with my X-Rite, and plot D-logE curves.
> I will do a sample size of at least two for each option.  If there is,
> indeed, a compression in the shadows, this should be obvious in the
> curves.
> 
> 	I will report results when I (finally) get around to doing this.
> 		CHEERS!
> 			BOB
> 
> 
> 
> 
> 
>