XVIII.—Dissolve bone glue, 250 parts, by heating in 1,000 parts of water, and add to the solution barium peroxide 10 parts, sulphuric acid (66° B.) 5 parts, and water 15 parts. Heat for 48 hours on the water bath to 80° C. (176° F.). Thus a syrupy liquid is obtained, which is allowed to settle and is then decanted. This glue has no unpleasant odor, and does not mold.
XIX.—A glue possessing the adhesive qualities of ordinary joiners’ glue, but constituting a pale yellow liquid which is ready for use without requiring heating and possesses great resistance to dampness, is produced by treating dry casein with a diluted borax solution or with enough ammonia solution to cause a faintly alkaline reaction. The preparation may be employed alone or mixed with liquid starch in any proportion.
Glue For Celluloid.
II.—A collodion solution may be used, or an alcoholic solution of fine celluloid shavings.
Glue To Form Paper Pads.—
| I.— | Glue | 3 1/2 ounces |
|---|---|---|
| Glycerine | 8 ounces | |
| Water, a sufficient quantity. | ||
Pour upon the glue more than enough water to cover it and let stand for several hours, then decant the greater portion of the water; apply heat until the glue is dissolved, and add the glycerin. If the mixture is too thick, add more water.
| II.— | Glue | 6 ounces |
|---|---|---|
| Alum | 30 grains | |
| Acetic acid | 1/2 ounce | |
| Alcohol | 1 1/2 ounces | |
| Water | 6 1/2 ounces |
Mix all but the alcohol, digest on a water bath till the glue is dissolved, allow to cool and add the alcohol.
| III.— | Glue | 5 ounces |
|---|---|---|
| Water | 1 ounce | |
| Calcium chloride | 1 ounce |