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2484. Red Writing Ink. Best ground Brazil wood, four ounces; diluted acetic acid, one pint; alum, half an ounce. Boil the ingredients slowly in an enamelled vessel for one hour, strain, and add an ounce of gum. 2485. Marking Ink without Preparation. There are several receipts for this ink, but the following is said to be one of the best of its kind: Dissolve separately, one ounce of nitrate of silver, and one and a half ounce of best washing soda in distilled or rain water. Mix the solutions, and collect and wash the precipitate in a filter; whilst still moist, rub it up in a marble or Wedgwood mortar with three drachms of tartaric acid; add two ounces of distilled water, mix six drachms of white sugar, and ten drachms of powdered gum arabic, half an ounce of archil, and water to make up six ounces in measure. 2486a. Ink for Zinc Garden Labels. Verdigris, one ounce; sal-ammoniac, one ounce; lampblack, half an ounce; water, half a pint. Mix in an earthenware mortar, without using a metal spatula. Directions.--To be shaken before use, and used with a clean quill pen, on bright zinc. Note.--Another kind of ink for zinc is also used, made of chloride of platinum, five grains, dissolved in one ounce of distilled or rain water; but the first, which is much less expensive, answers perfectly, if used as directed, on clean bright zinc. 2486b. Manifold Writing [1]. The demand for a rapid and simple method of multiplying letters, circulars, &c., has led in recent years to the invention of several ingenious processes. So few copies are obtainable by the ordinary reporters' system of sheets of tissue paper, or "flimsy," interleaved with sheets of prepared black paper, that various kinds of "graphs" have been produced, by which upwards of a hundred, and in some cases many more, copies may be produced from one writing.