Green Ink
Dissolve 180 grains Bichromate of Potash in one fluid ounce
of Water; add while warm one-half ounce Spirits of Wine, then decompose
the mixture with concentrated sulphuric acid until it assumes a brown
color; evaporate this liquid until its quantity is reduced one-half,
dilute it with two ounces distilled water, filter it, add one-half
ounce Alcohol, followed by a few drops of strong sulphuric acid; it is
now allowed to rest, and after a time it assumes a beautiful green
color. Add a small quantity Gum Arabic and it is ready for use.