The cement commonly used for fastening the tops on kerosene lamps is plaster of paris, which is porous and quickly penetrated by the kerosene. Another cement which has not this defect is made with three parts of resin, one of caustic soda and five of water. This composition is mixed with half its weight of plaster of paris. It nets firmly in about three-quarters of an hour. It is said to be of great adhesive power, not permeable to kerosene, a low conductor of heat and but superficially attacked by hot water.
K. Macerate 5 parts of good glue in 18 parts of water. Boil and add 9 parts rock candy and 3 parts gum arabic.
2. Mix dextrine with water and add a drop or two of glycerine.
3 A mixture of 1 part of dry chloride of calcium, or 2 parts of the same salt in the crystallized form, and 36 parts of gum arabic, dissolved in water to a proper consistency, forms a mucilage which holds well, does not crack by drying, and yet does not attract sufficient moisture from the air to become wet in damp weather.
4. For attaching labels to tin and other bright metallic surfaces, first rub the surface with a mixture of muriatic acid and alcohol; then apply the label with a very thin coating of the paste, and it will adhere almost as well as on glass.
5. To make cement for attaching labels to metals, take ten parts tragacanth mucilage, ten parts of honey, and one part flour. The flour appears to hasten the drying, and renders it less susceptible to damp. Another cement that will resist the damp still better, but will not adhere if the surface is greasy, is made by boiling together two parts shellac, one part borax, and sixteen parts water. Flour paste to which a certain proportion of nitric acid has been added, and heat applied, makes a lasting cement, but the acid often acts upon the metals. The acid converts the starch into dextrine.
6. The Archives of Pharmacy gives the following recipe for damp-proof mucilage for labels: Macerate five parts of good glue in eighteen to twenty parts of water for a day, and to the Liquid add nine parts of rock candy and three parts of gum arabic. The mixture can be brushed upon paper while lukewarm; it keeps well, does not stick together, and, when moistened, adheres firmly to bottles. For the labels of soda or seltzer-water bottles, it is well to prepare a paste of good rye flour and glue, to which linseed-oil, varnish, and turpentine have been added, in the proportion of half an ounce each to the pound. Labels prepared in the latter way do not fall off in damp cellars.