GREEN.—Arsenate of Potash, wash with Nitrate of Copper.
PURPLE.—Solution of Gold and Muriate of Tin.
BLACK.—Perchloride of Mercury, the wash is Hydrochloric of Tin.
BLACK INK.—Extract of Logwood one ounce, Bicromate of Potash one-quarter ounce. Pulverize and mix in a quart of soft hot water. This makes a beautiful jet black ink, which will not spoil by freezing.
COPYING INK.—One-half gallon of soft water, one ounce Gum Arabic, one ounce Brown Sugar, one ounce clean Copperas, three ounces powdered Nut Gall. Mix and shake occasionally from 7 to 10 days and strain. The best copying ink made.
BLACK INK.—Shellac four ounces, Borax two ounces, Water one quart; boil till dissolved and add two ounces Gum Arabic, dissolved in a little hot water; boil and add enough of a well triturated mixture of equal parts of Indigo and Lampblack to produce a copper color. After standing several hours draw off and bottle.
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.
BEAUTIFUL BLUE WRITING FLUID.—Dissolve Basic or Soluble Prussian Blue in pure water. This is the most permanent and beautiful blue ink known.
VIOLET COPYING INK.—For blue violet dissolve in 300 parts of boiling water, Methyl Violet, 5 B, Hofman's Violet, 3 B, or Gentiana Violet, B. For reddish violet dissolve in a similar quantity of water Methyl Violet BR. A small quantity of sugar added to these inks improves their copying qualities. If the writing when dry retains a bronzy appearance, more water must be added.
NEW INVISIBLE INK.—C. Wideman communicates a new method of making an invisible ink to Die Natur. To make the writing or drawing appear which has been made upon paper it is sufficient to dip it in water. On drying the traces disappear again, and reappear again at each succeeding immersion. The ink is made by intimately mixing Linseed Oil one part. Water of Ammonia twenty parts, Water 100 parts. The mixture must be agitated each time before the pen is dipped into it, as a little of the oil may separate and float on top, which would, of course, leave an oily stain upon the paper.