U of S | Mailing List Archive | alt-photo-process-l | Re: Selenium-toning Van Dyke Brown prints

Re: Selenium-toning Van Dyke Brown prints

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: Selenium-toning Van Dyke Brown prints
  • From: Richard Knoppow <dickburk@ix.netcom.com>
  • Date: Tue, 26 Sep 2006 17:59:46 -0700
  • Comments: "alt-photo-process mailing list"
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----- Original Message ----- From: "Loris Medici" <mail@loris.medici.name>
To: <alt-photo-process-l@usask.ca>
Sent: Tuesday, September 26, 2006 9:35 AM
Subject: RE: Selenium-toning Van Dyke Brown prints

I was told that it's not a proportional toner; it tones the shadows and the
highlights at the same rate/time. But you can see its effect a little bit
quicker in the highlights. Therefore if you use it diluted and/or watch very
closely and snatch on the right time, you may get a split tone effect.


This is then the opposite of what it does to silver-gelatin. Selenium tends to tone the finest grains first. since they are the least sensitive they tend to be in the denser areas of the image so the shadows of a print tone before the highlights. This is supposed to be the problem with using Selenium to protect silver images. If toning progresses far enough it will tone everything but partial toning will tend to split tone to some degree.
Has anyone tried a polysulfide toner, like Kodak Brown Toner, on van Dyke? On conventional silver emulsions KBT tones uniformly so it can be used for partial toning.
It would be interesting to know what other toners for silver-gelatin will work on other processes, for instance, would Nelson's Gold work on van Dyke?

Richard Knoppow
Los Angeles, CA, USA