Sacramento Daily Union, Volume 59, Number 16, 10 March 1888 — PRACTICAL RECIPES. [ARTICLE]

PRACTICAL RECIPES.

A recipe for the padding glue so commonly used t>v printers throughout the country: Uw a cheap clue, with "> per cent, glycerine, made into a mixture with any writable coloring material. Some ok ordinary rubber cement, made by dissolving rubber in carbon disuiphide. To make a strong parchment paper dilute strong sulphuric acid with one-half its volume of water and allow it to cool t<> about tio 0 Fah, Then immerse unsir.t rl paper in the cold acid for 10 to 50 seconds, according to its thickness. The paper is then well washed in cold running water and dipi«d in dilute ammoni i, :u:iin washed in water and finally dried. J'atcnt leather tint blocks are said to produce most excellent results in letterpress printing. Use the be*t and thickest that can be obtained »nd glue a piece rather larger than the size of the tint block required to a wooden background; squeeze out air bubblrs and keep under pressure until set- Trim down the leather to the required size, and the tint block, which is almost everlasting and gives results beautifully clear and uniform, is complete. An Indian ink of a deep black which gives neutral tints for half shades is very rare, but may be made as follows : Bob thoroughly together eight parts of lampblack; sixty-four parts of water and four parts of finely pulverized indigo. Boil until mo?t of the water is evaporated, then add live parts of gum arabi- . two parts of glue and one part extract of chicory. Boil the mi~ ai^ain until it is thickened to a paste, then shape it in wooden molds which have previously been rubbed with olive or almond oil. A c ry.-filline coating for paper may, it is said, be obtained by mixing a very concentrated cold solution of salt with dextrine, and laying the thinnest coating of the fluid on the surface to be covered by means of a broad soft brush. After drying, the ?urface has a beautiful bright mother-of-pearl coating, which, in consequence of the dextrine, adhere? closely to paper or wood. The coating may l«e made adhesive t< i by doing it over with an alcoholic shellac > ■'lution. Sulphate of magnesia, acetate of soda and sulphate of tin are among the salts which produce the most attractive crj>talline coatings. Paper must fir-t be sized, otherwise it will a!>sorb the liquid and prevent the formation of crystals. — Staiionv and Printa: