[pure-silver] Re: Toner for chocolate brown tone
----- Original Message ----- From: "Tim Rudman" <tim@xxxxxxxxxxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
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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