This
objection does not obtain for the first, provided, however, that
ordinary lime water is not used, but a solution of succharate or
sucrate of lime. In my experiments I have made use of the following
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.
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