[pure-silver] Re: Toner for chocolate brown tone

The chocolate brown I refer to would be a dark medium to dark chocolate color.  
I found I could vary the degree of darkness by how long I left it in the Pot. 
Ferri.  The more it went organge, the warmer it became.  Or the more it went 
towards a milk chocolate color.  I didn't get any residual reds.
   
  Aggie  

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

Sent: Saturday, February 17, 2007 4:04 PM
Subject: [pure-silver] Re: Toner for chocolate brown tone


>
> Hi Aggie
> just home from a trip and picked up this thread. This is 
> the basis of
> 'Chinese prints' but that process goes further by using 
> strong bleach. If a
> strong enough bleach (like iodine) it ultimately gives the 
> bright orange of
> selenium after removing all the black silver, but there 
> are many colours in
> between (see my toning book, pages 52/53)
> Tim
>

I think it would be useful to define the colors being 
discussed. I interpret "choclate brown" to be a dark coldish 
brown, not reddish and not purple. Perhaps Aggie meant 
something else.
The color of a toned image is strongly influenced by the 
nature of the original silver image and by bleaching, where 
in indirect toner is used. One illustration of this is the 
Defender series of indirect toners for Varigam. Formulae are 
given for three bleaches and three toners. All the toners 
use Thiocarbamide rather than Potassium sulfide. The three 
bleaches include one with Sodium Chloride in it, one with 
Potassium Bromide, and one with Potassium Iodide. The three 
toners vary in pH. One has Sodium Hydroxide, one Sodium 
Carbonate, the other Potassium Carbonate.
The color chart indicates the coldest tone (slightly 
purplish brown) is had with the Chloride bleach and high pH 
toner, the tone becoming yellower with other combinations.
Varigam was the first commercially available variable 
contrast paper and had a neutral image color similar to 
papers like Kodabromide.
Liver of Sulfur toners like Kodak Brown Toner can be used 
as redevelopers in indirect toning as well as as direct 
toners. I have not experimented with the color range 
possible.
It seems to me that a strong Iodide bleach would convert 
the silver to Silver Iodide which could then be toned with 
KBT or any of the indirect toner formulas. I may try this 
since I have the necessary materials for it at hand.

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

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