Toning Black-and-White Materials • G-23 7
Sulfide Sepia Toner T-7a
Prepare Stock Solutions A and B as follows:
Sulfide Sepia Toner T-7a
To prepare the working bleach and toner (redeveloper)
solutions, mix them as follows:
1. Immerse a thoroughly washed print in the bleach, and
agitate until only a faint yellowish brown image
remains. This will take approximately 5 to 8 minutes.
2. Rinse the print in cold running water for at least
2 minutes.
3. Immerse the print in the toning bath, and agitate until no
further change occurs in the tone. This will take
approximately 30 seconds.
4. Immediately rinse the print with water.
5. Treat fiber-base prints in a bath made from 1 part
KODAK Liquid Hardener and 13 parts water (or 2 parts
Hardener F-5a and 16 parts water) for 2 to 5 minutes.
*
*
Wash fiber-base prints in running water at 18 to 24°C
(65 to 75°F) for 30 minutes; wash resin-coated prints for
4minutes.
Bleach—Stock Solution A
Water at 20°C (68°F) 2 L
Potassium ferricyanide (anhydrous) 75 g
Potassium bromide (anhydrous) 75 g
Potassium oxalate 195 g
28% acetic acid
*
* To make approximately 28% acetic acid from glacial acetic acid, add
3 parts of glacial acetic acid to 8 parts water.
40 mL
Toner—Stock Solution B
Sodium sulfide (anhydrous) 45 g
Water at 20°C (68°F) 500 mL
Bleach Working Solution
Stock Solution A 500 mL
Water at 20°C (68°F) 500 mL
Toner Working Solution
Stock Solution B 125 mL
Water at 20°C (68°F) 375 mL
* Eliminate this treatment if prints were treated with a hardening fixer during
processing. We recommend using a non-hardening fixer such as KODAK
PROFESSIONAL Rapid Fixer Part A only for prints that you plan to tone.
Hardener F-5a
Gold Toner T-1a
Mix the two stock solutions as follows:
Gold Toner T-21
Mix the toner working solution as follows:
Let the mixed solution stand for about 8 hours before
using it. During this time, a yellow precipitate will form.
Pour the clear solution into another container and discard the
precipitate.
Stock Solution
Water at 50°C (125°F) 600 mL
Sodium sulfite (anhydrous) 75 g
28% acetic acid
*
* To make approximately 28% acetic acid from glacial acetic acid, add
3 parts of glacial acetic acid to 8 parts water.
235 mL
Boric acid, crystals
†
† Avoid using powdered boric acid; it does not dissolve easily.
375 g
Potassium alum (dodecahydrated) 75 g
Water at 20°C (68°F) 1L
Stock Solution A
Water at 50°C (125°F) 4 L
Sodium thiosulfate, crystals 960 g
Potassium persulfate 120 g
Dissolve the sodium thiosulfate in the water. While stirring
vigorously, add the potassium persulfate. If the mixture does
not turn milky, increase the temperature. Cool to 27°C (80°F).
Then slowly add the following solution, including the
precipitate, while stirring. Solutions must be cool when you
combine them.
Water at 20°C (68°F) 64 mL
Silver nitrate, crystals
*
* Let the silver nitrate dissolve completely before you add the sodium
chloride.
5 g
Sodium chloride 5 g
Stock Solution B
Water at 20°C (68°F) 250 L
Gold chloride
*
* Gold chloride is a deliquescent chemical; it will liquefy rapidly in a
normal room atmosphere. Store the chemical in a tightly stoppered
bottle in a dry atmosphere.
1 g
Toner Working Solution
Stock Solution A
Entire
amount
While stirring rapidly, slowly add—
Stock Solution B 125 mL
