[pure-silver] Re: KRST
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 24 Aug 2007 10:43:31 -0700
----- 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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Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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