Originally Posted by
Jim Noel
Hypo Alum Sepia Toner T-1a
This toner will cause a loss of print density and contrast. You
can compensate for this by increasing the exposure time and
the development time when you make your prints.
Mix the toner as follows:
Hypo Alum Sepia Toner T-1a
1. Place a tray in a tempered water bath. Pour the toner into
the tray, and heat the water to 49°C (120°F).
2. Immerse a thoroughly washed print in the toner, and
agitate it occasionally, especially during the first few
minutes of toning. Tone for 12 to 15 minutes, depending
on the paper type. Don’t tone prints for longer than
20 minutes at 49°C (120°F), and don’t use a higher
temperature. (Prints will blister or stain at higher
temperatures.)
3. Rinse the print in warm water, and wipe it with a soft
sponge to remove any sediment.
Wash fiber-base prints in running water at 18 to 24°C
(65 to 75°F) for one hour, or use Hypo Clearing Agent to
reduce the wash time; wash resin-coated prints for 4 minutes.
Water at 20°C (68°F) 2.8 L
Sodium thiosulfate (pentahydrated) 480 g
Mix thoroughly; then add the following solution:
Water at 70°C (160°F) 640 mL
Potassium alum (dodecahydrated) 120 g
Then add the following solution (including the precipitate)
slowly to the hypo alum solution while stirring rapidly*:
* When you combine the solutions, a black precipitate may form. It will
not adversely affect the toning action of the bath if you use the proper
toning technique.
Water at 20°C (68°F) 64 mL
Silver nitrate, crystals†
† Let the silver nitrate dissolve completely before you add the sodium
chloride.
4 g
Sodium chloride 4 g
After combining the solutions, add—
Water at 20°C (68°F) to make 4 L
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