Waterproof Label Ink.—

It has long been known that a solution of bichlorate of sodium, or « borax, » possesses the property of dissolving or softening various resins which are unaffected by plain water and by a great majority of saline solutions. As a basis for a permanent label ink, unaffected by water or moderately strong acids, there is nothing equal to a half-saturated solution of ordinary borax, duly charged with as much orange shellac as it will take up on boiling for twenty minutes. Similarly a most useful water-varnish for photography and drawings may be prepared, only substituting bleached shellac for the colored variety.