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


TONING.

Gold. 1 grain.
Water. 5 ounces.

With this a very fine depth is soon attained, and a nice picture the
result. Leave out the toning, and only a poor, sunken-looking picture
will be the outcome; but directly the toning bath is employed richness