Читать книгу Henley's Formulas, Recipes and Processes (Applied Chemistry) - Various - Страница 113
Waterproof And Acidproof Pastes.—
Оглавление| I.— | Chromic acid | 2 1/2 parts |
|---|---|---|
| Stronger ammonia | 15 parts | |
| Sulphuric acid | 1/2 part | |
| Cuprammonium solution | 30 parts | |
| Fine white paper | 4 parts | |
| II.— | Isinglass, a sufficient quantity | |
| Acetic acid | 1 part | |
| Water | 7 parts |
Dissolve sufficient isinglass in the mixture of acetic acid and water to make a thin mucilage.
One of the solutions is applied to the surface of one sheet of paper and the other to the other sheet, and they are then pressed together.
III.—A fair knotting varnish free from surplus oil is by far the best adhesive for fixing labels, especially on metal surfaces. It dries instantly, insuring a speedy job and immediate packing, if needful, without fear of derangement. It has great tenacity, and is not only absolutely damp-proof itself, but is actually repellent of moisture, to which all water pastes are subject. It costs more, but the additional expense is often infinitesimal compared with the pleasure of a satisfactory result.
