The Dictionary Of Photography

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

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Intensification
B.
Silver nitrate ............        2 parts.
Distilled water ............     ioo ..
The plate should, first of all, be flowed over once or twice with
Solution A, and then to every 50 parts of A 30 to 40 parts of B should be added. Belitzski suggests the following: -
A.
Gallic acid...............        1 part.
Hot distilled water............     100 parts.
Dissolve and filter ; when cold, add an equal volume of
Silver nitrate ... ... ......        1 part.
Acetic acid, glacial...... ... ...        1 ,,
Distilled water ... ...... ...      50 parts.
The following has also been suggested : -
I.
Silver nitrate ... ... ... ...      22 parts
Distilled water ......... ...    250 ..
II.
Potassium bromide...... ......      10 parts.
Distilled water ............      25 ,,
Mix, collect the precipitate, wash thoroughly, and dissolve in
Sodium hyposulphite         ... ... ... 60 parts.
Distilled water         ......... ... 170 ..
The mixture is thoroughly stirred, allowed to stand for a few hours, and filtered, sufficient water .being added to make the total bulk measure 450 parts. The plate is soaked in this solution for 5 minutes, drained, and a ferrous oxalate developer applied, and then washed and dried. The following intensifier has also been suggested for negatives of line work, but is also applicable to ordinary work: -
A.
Potassium bromide......... ... 1 part.
Water           ... ......' ...... 16 parts.
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