Paper Varnishes
Use of Dewaxed Bleached Shellac in Paper Varnishes
Use of Dewaxed Bleached Shellac in
Paper Varnishes
Enormous quantities of paper varnishes are used annually for glazing paper wrappers, labels, display cards etc. While shellac of sufficiently light colour is comparatively expensive, where adhesion and high gloss are imperative, it is an essential ingredient. Here is an interesting paper varnish, comprising an aqueous solution of shellac and casein.
Parts by Weight | Parts by Weight | ||
| Dewaxed Bleached Shellac | 100 | Casein | 23 |
| Borax | 25 | Water | 100 |
| Oleic Acid | 20 | Ammonia to | |
| Water | 360 | Dissolve |
The casein is dissolved by moistening with water, warming to 60 c and adding enough Ammonia to dissolve it. An antifoaming agent such as one of the proprietory silicons and a preservative must be used.