The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Kallitype
For developing this, either of the two following solutions is used: -
I.
Potassium citrate.........      15 per cent.
Sodium acetate ... ... ...      10 .. ,,
Silver, nitrate           .........      1*5 .. ..
Ammonia to dissolve the precipitate first formed.
Potassium citrate ... ... ... 15 per cent.
Potassium oxalate ... ... ... 10 ,, ,,
Silver nitrate           ...... ... 1*5 .. ,,
Ammonia as above. After development the prints should be placed in a clearing bath of a 20 per cent, solution of citrate or tartrate of potassium, sodium or ammonium rendered alkaline by liquid ammonia. If greater contrasts are desired, 2 to 10 parts of a 5 per cent, solution of potassium bichromate should be added to every 1000 parts of the developer. A modification of the process was published later, in which the silver was incorporated with the sensitising solution, and applied to the paper, the solu-tion being a mixture of ferric oxalate, ferric tartrate, oxalate and nitrate of silver, and free nitric acid. The prints were developed on the following solutions : -
For Black Tones.
Rochelle salts ............      10 parts.
Borax...... ... ... ......      10 ..
Water ...............    200 ..
For Purple Tones.
Rochelle salts ............       10 parts.
Borax... ... ... ... ... ...     2-5 ,,
Water ...............     100 ..
For Sepia Tones.
Rochelle salts          ............ 5 parts.
Borax..................    175 part.
Water           ...............     100 parts.
Hydrochloric acid............    a few drops.
To the developers a few drops of a dilute solution of potassium
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