186 



C. U. C. P. ALUMNI JOURNAL 



^^:\E> s^STT&^crr-^ 1 1 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 

 boiling by means of a bunsen flame, it 

 will assume a dark-brown or black ap- 

 pearance, either at once or upon stand- 

 ing, depending upon the quantity of 

 iodine present in the sample under ob- 

 servation. If much iodine be present 

 a brown or black precipitate may be 

 noted. If, after cooling the liquid, 

 chloroform be added and the mixture 

 shaken, the color will be taken up al- 

 most entirely by this. Under the same 

 treatment a sample of iodine-free urine 

 will not become colored at all, or at most 

 only a straw-yellow coloration will be 

 noted. 



Copaiba and Oil of Sandalwood 

 Capsules. 



W. Beckers, in Apoth, Ztg., 12, re- 

 ports on the results of an examination 

 of these as follows : Of eight samples 

 of copaiba capsules examined, only three 

 were found to contain an article meeting 

 all requirements of the D. A, B. In 



