solutions:

_Solution A._

Pyrogallic acid. 10 grms.
Sulphite of soda. 20 "
Citric acid. 2 "
Water. 120 "

_Solution B._
Water. 1000 "
Sugar. sufficient quantity to triturate.

To which add a sufficient quantity of pure lime to saturate the sugar
solution.

In this manner we get a highly concentrated liquid, very alkaline, and
which keeps for a considerable time. To develop, I mix:

Water. 80 cubic cent.
Solution A. 2 " "

I throw this over the plate, and allow it to remain for a few moments,
agitating, then I add to this bath gradually and according to the
results obtained, from one to two cubic centimeters of the solution B.
These solutions should be made with a great deal of care and prudence,
as the sucrate of lime is an accelerator of very great energy.
Moreover, according as the plate has been more or less exposed, we may
add to the developing bath a few drops of a solution of citric acid,
or of a solution of an alkaline bromide. We obtain in this way very