. alumni journal. Columbia University. College of Pharmacy; Pharmacology. 186 C. U. C. P. ALUMNI JOURNAL. ^^:\E> s^STT&^crr-^ 11 I Conducted by Prof. George C. Diekman. Coloring and Affixing Tinfoil. Before applying the required color to the tinfoil this must first be freed from any adhering fat. This is easily ac- complished by treating the sheet tinfoil with a mixture of prepared chalk and alcohol in the form of a smooth paste. Only the best kinds of prepared chalk should be employed, as otherwise the tinfoil will lose its lustre. After such treatment washing and drying are-
. alumni journal. Columbia University. College of Pharmacy; Pharmacology. 186 C. U. C. P. ALUMNI JOURNAL. ^^:\E> s^STT&^crr-^ 11 I Conducted by Prof. George C. Diekman. Coloring and Affixing Tinfoil. Before applying the required color to the tinfoil this must first be freed from any adhering fat. This is easily ac- complished by treating the sheet tinfoil with a mixture of prepared chalk and alcohol in the form of a smooth paste. Only the best kinds of prepared chalk should be employed, as otherwise the tinfoil will lose its lustre. After such treatment washing and drying are- re- sorted to, after which the selected color, properly prepared, is applied by means of a camel-hair brush. The coloring liquid is prepared as follows: lOO parts of bleached shellac are dissolved in 500 parts of 96% alcohol in the cold. To this solution are added 50 parts of the best grade of elemi resin, and 12 parts of clear Venetian turpentine. The liquid is filtered and a sufficient quantity of an alcoholic solution of the desired color- ing matter added. To affix tinfoil to containers or other surfaces, the follow- ing may be employed: i. A paste made by treating 10 parts of rye flour with 4 parts of caustic soda, adding a suffi- cient quantity of distilled water, a small quantity of turpentine and the whole mixed thoroughly. 2. A paste made by mixing 50 to 60 parts of confectioners' sugar with 180 to 200 parts of solution of sodium silicate, avoiding heat. Only alcohol soluble coloring materials are to be employed. A Sensitive Test for Iodine in Urine, The following procedure is recom- mended by J. Schumacher, in Deutsche Med. Wochcnschr., 532. A given vol- ume of urine is decomposed by addition, of an equal volume of solution of hydro- gen dioxide. To this mixture is then added a one per cent, alcoholic solution of benzidin, in volume equal to one-fifth of the volume of urine taken, and the whole thoroughly mixed. If, now, the upper layer of the liquid be heated to boil
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