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Intensification |
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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 ,, |
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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.
412 |
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