Blue Marking Ink for White Goods.
| Crystallized nitrate of silver, dram | 1 | |
| Water of ammonia, drams | 3 | |
| Crystallized carbonate of soda, dram | 1 | |
| Powdered gum arabic, drams | 1½ | |
| Sulphate of copper, grains | 30 | |
| Distilled water, drams | 4 |
Dissolve the silver salt in the ammonia; dissolve the carbonate of soda, gum arabic, and sulphate of copper in the distilled water, and mix the two solutions together.