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To Keep Glue from Souring

If a little muriatic acid be put into glue Glue. The hotter the glue, the more when it is dissolved, ready for use, it will re force it will exert in keeping the two tain the glue in the same condition for a long parts glued together; therefore, in all large time. It will neither dry up nor ferment. and long joints the glue should be applied Liquid glue is made in this way, and sold in immediately after boiling. Glue loses much bottles. The use of a small portion of sugar of its strength by frequent re-melting; that of lead will also prevent fermentation. glue, therefore, which is newly made, is much 2283. To Prepare Glue for Ready Use. preferable to that which has been re-boiled.

In melting ordinary glue in the double vessel containing water, it is an excellent method to add salt to the water in the outer vessel. It will not boil then, until heated considerably above the ordinary boiling point; the consequence is, the heat is retained, instead of passing off by evaporation, and when the water boils, the glue will be found to be thorougly and evenly melted. 2278. To Prevent Glue from Cracking. Glue is often found to crack in very dry localities, particularly when the objects glued together are not in close contact, but have a thin layer of glue between them; in which case they sometimes fall apart. Very thin layers of glue are not only exceedingly hard, but also more or less brittle when extremely dry; and, therefore, to prevent this dry and consequent brittle condition, the addition of a very small quantity of glycerine will accomplish the desired end. The quantity of glycerine must be modified according to circumstances.