INVISIBLE INK.—Sulphuric Acid one quart, Water twenty parts; mix together and write with a quill pen, which writing can be read only after heating it.
HORTICULTURAL INK.—Copper one part, dissolve in Nitric Acid ten parts and add Water ten parts; used to write on zinc or tin labels.
GOLD INK.—Honey and Gold Leaf equal parts, Turpentine until the Gold is reduced to the finest possible state of division, agitate with thirty parts Hot Water and allow it to settle. Decant the Water and repeat the washing several times; finally dry the Gold and mix it with a little Gum Water for use.
SILVER INK.—For silver ink the process is the same as gold, substituting Silver Leaf for the Gold leaf.
INDELIBLE INK FOR GLASS OR METAL.—Borax one ounce, Shellac two ounces, Water eighteen fluid ounces; boil in a covered vessel, add of thick Mucilage one ounce; triturate it with Levigated Indigo and Lamp Black q.s. to give it a good color. After two hours' repose decant from the dregs and bottle for use. It may be bronzed after being applied. Resists moisture, chlorine and gases.
BROWN INK.—A strong decoction of Catechu. The shade may be varied by the cautious addition of a little weak solution of bicromate of potash.
LUMINOUS INK.—Shines in the dark. Phosphorous one-half drachm, Oil Cinnamon one-half ounce; mix in a vial, cork tightly, heat it slowly until mixed. A letter written in this ink can only be read in a dark room, when the writing will have the appearance of a fire.
TICKETING INK FOR GROCERS, ETC.—Dissolve one ounce of Gum Arabic in six ounces of Water and strain; this is the Mucilage; for a black color use Drop Black, powdered and ground with the mucilage to extreme fineness; for blue, Ultra-Marine is used in the same manner; for green, Emerald Green; for white, Flake White; red, Vermillion, Lake or Carmine; for yellow, Chrome Yellow. When ground too thick they are thinned with a little water. Apply to the cards with a small brush. The cards may be sized with a thin glue, afterward varnished, if it is desired to preserve them.
COMMON INK.—To one gallon boiling Soft Water add three-fourths ounce Extract of Logwood; boil two minutes; remove from the fire and stir in forty-eight grains Bichromate of Potash and eight grains Prussiate of Potash. For ten gallons use six and one-half ounces Logwood Extract, one ounce Bichromate of Potash, and eighty grains Prussiate Potash; strain. Six cents should buy the former and twenty-five cents the latter.
RED INK.—In an ounce phial put one teaspoonful Aqua Ammonia, Gum Arabic size of two or three peas, and six grains No. 40 Carmine. Fill up with soft water and it is soon ready for use.