[pure-silver] Re: Sepia Toners

Thanks, I know of their archival qualities and the range of hues that can be 
attained with dilutions.
After I setup my darkroom again I'll try bleach/tone to see what happens

Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote: 
----- Original Message ----- 
From: "titrisol" 
To: 

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.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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