- Solution
A
- water :- 700ml
- Copper Sulphate
Cryst. :- 25 grammes
- Potassium Citrate
:- 110 grammes
- Water make up to
:- 1000ml.
- Solution
B
- water :- 700ml.
- Potassium ferricyanide
:- 20 grammes.
- Potassium citrate
:- 110 grammes.
- Water to :- 1000ml.
|
Use one
part A + one part B. The results range from warm black to purplish-red, depending
on how long the print is immersed. Wash for 30 minutes.