[pure-silver] Re: Sepia Toners
----- Original Message ----- From: "titrisol" <titrisol@xxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, January 27, 2008 10:42 PM
Subject: [pure-silver] Re: Sepia Toners



Then you make me wonder.
Ihave always liked viradon, the new one is still OK with warmtone papers. But I have never tried bleaching before viradon.... would it act as an indirect toner then? Would it sulfide the images, thus producing some light brown tones (sepia like)?
The original Viradon was a combination of polysulfide and selenium toner, the later version had only the polysulfide. Kodak also made a combination toner called Polytoner. Polysulfide toners are simple and quite effective. Kodak Brown Toner is a polysulfide toner. One advantage of these toners is that they tone all densities equally so that they can be used for partial toning for image protection. The reason Kodak Rapid Selenium Toner is not long recommended for image protection of microfilm is that it does not tone low density areas as quickly as high density ones. So, when used in the high dilutions that were recommended the lighter densities remain unprotected. A greater amount of toning does protect the entire image but for microfilm use the greater amount of toning was undisirable for various reasons. The current recommendation is KBT or some other polysulfide toner. The later version of Viradon was also a poly sulfide toner. These are "direct" toners and can be used in a way similar to the hypo-alum types except that the image color may not be the same. Kodak has a published formula for a polysulfide toner but I don't have it at the moment. Its not as concentrated as KBT but Dr. Nishimura, of IPI, told me it was suitable for image protection purposes. I have also posted in the past a couple of formulas for combination toners made from KBT and KRST with some added alkali. These are evidently not identical to Polytoner but produce similar results. KBT or Viradon are similar to other direct toners in that they tend to produce colder browns than the bleach and redevelop type. 

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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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