The Dictionary Of Photography

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

Home | About | Photography | Contact






Reduction of Density
more ferridcyanide added, the stronger and quicker the action ; when only a little ferridcyanide is used, the action proceeds slowly and the gradation does not suffer, with larger quantities the shadows can be eaten away and the contrasts increased.
Belilski's Reducer. This is the most convenient as it is one solution, will keep in the dark indefinitely, can be used over and over again, and when inactive and exhausted the colour changes.
Potassium ferric oxalate ...... ... 22 grs.
Sodium sulphite ... ... ... ... 18 ..
Water           ...... ... ... ... 1 oz.
When dissolved add -
Oxalic acid......... ... ... 3 grs.
and shake till the blood-red solution turns green; decant from any undissolved acid, then add -
Sodium hyposulphite         ... ... ... 120 grs.
Dissolved in
Water           ... ... ... ... ... oz.
This can be applied immediately after fixing or to a previously dried negative, and causes no stain.
Eau de Javelle. The method of using this is as follows : -
Solution I.
Chrome alum           ... ...... ... 20 grs.
Distilled water         ... ... ... ... 1 oz.
Solution II. Eau de Javelle or Labarraque's Solution.
The Reducer.
Solution I. ... ... ... ... ... oz.
11 **« ••• ••• ••• ••• ••• u
Water          ............... 5 ..
This mixture is first of a thick green colour, and then turns to a clear yellow. If the negative has been dried, soak in water till wet, then cover with the reducer, and, when sufficiently reduced, wash and refix in hypo. It is well adapted for local reduction as a little of Solution II. may be applied on the tip of the finger, Cupric Chloride, Spiller suggested the use of -
552