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.

BUCHER'S CARMINE INK.—Pure Carmine, twelve grains, Water of Ammonia three ounces, dissolve, then add Powdered Gum eighteen grains. One-half drachm of Powdered Drop Lake may be substituted for the Carmine, where expense is an object.

BRILLIANT RED INK.—Brazil Wood two ounces, Muriate of Tin one-half drachm, Gum Arabic one drachm. Boil down in 32 ounces water to one-half, and strain.

WHITE INK.—Mix pure freshly precipitated Barium Sulphate, or "Flake White," with Water containing enough Gum Arabic to prevent the immediate settling of the substance. Starch or Magnesium Carbonate may be used in a similar way. They must be reduced to palpable powders.

INDELIBLE INK FOR MARKING LINEN.—Add Caustic Alkali to a saturated solution of Corpous Chloride until no further precipitate forms; allow the precipitate to settle, draw off the supernatant liquid with a siphon and dissolve the hydrated copper oxide in the smallest quantity of Ammonia. It may be mixed with about 6 per cent of Gum Dextrine for use.

TO WRITE SECRET LETTERS.—Put five cents' worth Citrate of Potassa in an ounce vial of clear cold water. This forms an invisible fluid. Let it dissolve and you can use on paper of any color. Use quill pen in writing. When you wish the writing to become visible hold it to red hot stove.

BLACK COPYING INK OR WRITING FLUID.—Take two gallons of Rain Water, and put into it Gum Arabic one-fourth pound, Brown Sugar one pound, clean Copperas one-fourth pound, Powdered Nutgall three-fourths pound; mix, and shake occasionally for ten days, and strain; if needed sooner let it stand in an iron kettle until the strength is obtained. This ink will stand the action of the atmosphere for centuries if required.

TO MAKE RUBBER STAMP INK.—Dissolve Aniline in hot Glycerine, and strain while hot or warm.

COMMERCIAL WRITING INK.—Galls one ounce, Gum one-half ounce, Cloves one-half ounce, Sulphate of Iron, one-half ounce, Water eight ounces. Digest by frequent shaking till it has sufficient color. This is a good durable ink and will bear diluting.

TRAVELERS' INK.—White Blotting Paper is saturated with Aniline Black, and several sheets are pasted together, so as to form a thick pad. When required for use a small piece is torn off and covered with a little water. The black liquid which dissolves out is a good writing ink. A square inch of paper will produce enough ink to last for a considerable writing, and a few pads would be all that an exploring party need carry with them. As water is always available the ink is readily made. This is a perfectly original and new recipe. Any enterprising man can make a large income out of its manufacture.

INDELIBLE MARKING INK WITHOUT A PREPARATION.—Dissolve separately one ounce of Nitrate of Silver and one and one-half ounces of Sub-Carbonate of Soda (best washing soda) in rain water. Mix the solutions and collect and wash the precipitate in a filter; while still moist rub it up in a marble or hardwood mortar with three drachms of Tartaric Acid, add two ounces of Rain Water, mix six drachms White Sugar and ten drachms powdered Gum Arabic, one-half ounce Archill and Water to make up six ounces in measure. It should be put up in short drachm bottles and sold at twenty-five cents. This is the best ink for marking clothes that has ever been discovered. There is a fortune in this recipe, as a good marking ink is very salable.

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.