[pure-silver] Re: KRST

Thanks Richard!
                CHEERS!
                        BOB

-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Richard Knoppow
Sent: Friday, August 24, 2007 1:44 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: KRST


----- Original Message ----- 
From: "BOB KISS" <bobkiss@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, August 24, 2007 5:35 AM
Subject: [pure-silver] Re: KRST


> Do it again, please.
> CHEERS!
> BOB
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Combination Toners
These toners are similar but not identical to Kodak Poly 
Toner or the original version of Agfa Viradon. All three are 
made up by combining Kodak Brown Toner (KBT) and Kodak Rapid 
Selenium Toner (KRST). The first formula was originally 
published as a concentrate to be diluted 1 part stock to 3 
parts water. However, I am giving it as a working solution 
which makes solution of the carbonate easier.
No.1
Water                             500.0 ml
KBT                                80.0 ml
KRST                               20.0 ml
Sodium Carbonate, monohydrated     40.0 grams
Water to make                       1.0 liter
Use full strength.

     The original article does not specify the hydration of 
the carbonate, however, I've mixed it with monohydrated 
carbonate which worked well.

Source: "Modern Photography" magazine, Dec, 1953, p.87 
attributed to Kodak.

The following two formulas are from a Kodak booklet 
"Professional Printing with Kodak Photographic Materials" 
First Edition, 1953 printing, p.37

     Hue No.1 is described as "rich red-brown", hue No.2 is 
described as "a warm brown."
Hue No. 1
KRST                             17.0 ml
KBT                              75.0 ml
Kodalk                           30.0 grams
Water to make                     1.0 liter

Use full strength

To replenish add 30.0 ml of KRST 1:5 per each 10 8x10 prints 
toned.

Hue No.2
KRST                             2.0 ml
KBT                            100.0 ml
Kodalk                           8.0 grams
Water to make                    1.0 liter

Use full strength

To replenish add 30.0 ml of KRST 1:20 for each 10 8x10 
prints toned.

     Hue 2 tends to reduce the image slightly so prints to 
be toned should be printed slightly darker than desired for 
the final image.

     Kodalk is Sodium Metaborate, octahydrate. Probably 
Sodium Carbonate would also work.
These toners work very quickly, about 1 to 3 minutes for the 
magazine formula and Hue No.1 and about 7 minutes for Hue 
No.2 at room temperature.

     In order to make 1.0g sodium metaborate tetrahydrate, 
mix 0.692g borax and 0.145g sodium hydroxide, this is 
equivalent to the Metaborate in solution.
     This is the same substance called the octahydrate in 
older literature including Kodak's.  It is identical to 
Kodalk.

After toning prints should be directly immersed in a 10% 
solution of Sodium Sulfite or stock strength Kodak Hypo 
Clearing Agent. This will act as a stop bath for the toner, 
preventing after toning and staining in the wash. About one 
minute is enough. RC prints should be washed for 4 minutes. 
Single weight fiber prints should be washed for about 10 
minutes, double weight fiber prints for about 20 minutes.
This toner has a moderately strong odor of both Ammonia and 
of Hydrogen sulfide (rotten eggs) when working.
R. Knoppow 4 August 2005

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--

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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 

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