The plate thoroughly cleaned and coated with the collodion is now transferred to a bath, as follows:
Nitrate of silver (common) 25 grains to the ounce.
Made slightly acid with nitric acid.
After sensitizing, the plate is exposed in the usual way and taken to the room where pictures are ordinarily developed, and quantum suff. of the following poured into the developing cup to bring out the image:
DEVELOPING SOLUTION.
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