Show Ulll Inlrrnl f litmlU Chemlsta will be Interested tin announcement an-nouncement by the Chemlku Keltung of > delicate litmus paper glUng a sharp ruction Commercial cube humus Is I ei traded In a ircol < ttor with distilled water the extract being evnporntel down to Ihe aame weight aa that of the litmus useil and mlie1 wllh three limo a Its weight of M per cent alcohol The mixture la I then acidulated with nydrochlorlo l acid and allowed lo stand for two days Tho aiolltmlne will now be pretlnltated In the shape nf brown Hikes ho dull Motet coloring mailer remaining dissolved In the alcoholic milher Ilguor The precipitate Is I col heeled l on u filter and washed Inn I or three llnuo with acidulated water until the faintly reddish colored nitrate elves a pure blue with nmmonlu Tho aiolltmlno In the filter Is I then dlsolm In illillllfd water containing a tow drop of ammonia the nolullon diluted to three and a half llmeii the weight of the litmus originally tmlo > ed rx rlly neutralized and mixed with ten pr cent of alcohol In order to milk It kI better Prepared thus the tincture U I found to be an excellent Indicator Ibo change from red to bloc and vice versa being perfectly sharp |