A Winchester of water, i.e. 80 ounces.
Protosulphate of iron. 240 grains.
Citric acid. 240 "
Or the following may be used:
Pyro 3 grains\
Citric acid 2 " } per ounce of water.
Glacial acetic acid 30 drops /
After perfect development the picture is well washed and then fixed in a
saturated solution of hypo.; after which it is thoroughly washed.
It will now be found that the picture is not altogether satisfactory; it
lacks both vigor and color. To improve matters recourse is now had to