Rensselaer Republican, Volume 18, Number 34, Rensselaer, Jasper County, 29 April 1886 — Artificial Ivory. [ARTICLE]

Artificial Ivory.

There are several recipes for making artificial ivory. One kind, mncli manufactured in France, is a compound of gelatine and alumina. Tablets of gelatine or glue are immersed for some time in a solution of alumina in acetic or sulphuric acid. The alumina is absorbed from the acid into the gelatine, ■which is then removed a;d dried;—lt becomes very hard, so that it can take omn high polish. Another preparation called artificial ivory is made by working together bone or ivory dust with an equal portion--of albumen or gelatine to form a paste, which is rollod

into aheet»*nd dried. Another method, like the first mentioned, a French invention, is to take two parts of caoutchouc and dissolve in thirty-apt parts of chloroform and saturate the solution with pure gaseous ammonia. The chloroform is then off at a high temperature. The residue is then mixed with phosphate of lime, pressed into molds, and dried. \This is one of the best imitations known, possessing largely the nature and composition of true ivory. —lnter Ocean.