| Ammonium sulphocyanide | 22 | grains. | |
| Soda sulphite | 2 | " | |
| Gold chloride | 2 | " | |
| Water | 20 to 25 | ounces. |
Instead of weighing out two grains of sulphite it is more convenient to weigh twenty grains and dissolve in two-and-a-half ounces of water—i.e., at the rate of one grain per dram of solution. Thus, to mix this bath, take an ounce of the above-mentioned sulphocyanide solution dilute with twenty ounces water. To this add two drams (¼ oz.) of the sulphite solution. Then take two drams of the gold chloride solution and dilute with an ounce of water, and add slowly with stirring as before.
3. Another favourite bath is:—
| Sodium chloride (table salt) | 60 | grains. | |
| Ammonium sulphocyanide | 15 | " | |
| Gold chloride | 2 | " | |
| Water | 10 to 12 | ounces. |
Some of the adherents of this bath recommend that the prints be only washed in running water for a few minutes and then put into the toning bath. Others advise the prints to be immersed in the toning bath without any previous washing—i.e., straight from the printing frame.
4. Here, again, is another bath which usually yields excellent results:—
| Soda phosphate | 5 | grains. | |
| Sodium chloride (table salt) | 20 | " | |
| Gold chloride | 1 | grain. | |
| Water | 10 | ounces. |
5. Other workers omit the sodium chloride and increase the phosphate and get good tones.
| Soda phosphate | 20 | grains. | |
| Gold chloride | 1 | grain. | |
| Water | 10 | ounces. |
6. Others, again, combine the phosphate and sulphocyanide baths thus:—