r.
Sulphocyanide of potassium......... 12 gr.
Hyposulphite of soda............... 1/2 gr.
Water.............................. 2 oz.

The prints toned by this bath are, in our opinion, the finest of the whole.
The tone is a purple of the most brilliant and pleasing shade.

4.--Gold chloride...................... 1 gr.
Sulphocyanide of potassium......... 20 gr.
Hyposulphite of soda............... 5 gr.
Water.............................. 2 oz.

There is only one print, but it is from the same negative as one of the No.
3 group. It is very inferior to that in No. 3, the color less pleasant, and
the appearance generally as if the details of the lights had been bleached
by the large quantity either of hypo or of sulphocyanide of potassium.

5.--Gold chloride...................... 1 gr.
Sulphocyanide of potassium......... 50 gr.
Hyposulphite of soda............... 1/2 gr.
Water.............................. 2 oz.

Opposite to this description of formula there are no prints, but the
following is written: "These prints were completely destroyed, the
sulphocyanide of potassium (probably) dissolving off the gelatine."

6.--Gold chloride...................... 1 gr.
Sulphocyanide of potassium......... 20 gr.
Hypo............................... 5 gr.
Carbonate of soda.................. 10 gr.
Water.............................. 2 oz.

This it will be seen is the same as 4, but that the solution is rendered
alkaline with carbonate of soda. The result of the alkalinity certainly
appears to be good, the color is more pleasing than that produced by No. 4,
and there is less appearance of bleaching. It must be borne in mind in this
connection that the paper itself is strongly acid, and that, unless special
means be taken to prevent it, the toning bath is sure to be more or less
acid.

7.--Gold chloride...................... 1 gr.
Acetate of soda.................... 30 gr.
Water.............................. 2 oz.

The color of the prints toned by this bath is not exceedingly pleasing. It
is a brown tending to purple, but is not very pure or bright. The results
show, however, the possibility of toning the gelatino-chloro-citrate paper
with the ordinary acetate bath if it be only made concentrated enough.

8.--Gold chloride...................... 1 gr.
Carbonate of soda.................. 3 gr.
Water.............................. 2 oz.

Very m