THE ALUMNI JOURNAL 



95 



been washed in dilute solution of boiling potassium hydroxide). 

 This fabric is immersed in the mixture, washed with soap and water, 

 and then boiled with very dilute HCl. 



Dissolve the color from the silk or wool by means of ammonia 

 water. Take the fabric out, make the liquid acid with HCl. and 

 immerse another piece of silk and boil again. 



With the vegetable coloring matter this second dyling gives prac- 

 tically no color, and there is no danger of mistaking a vegetable color 

 for one of coal tar origin. 



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WHOLE PODS, HUNGARIAN PAPRIKA. 



Maximum. 

 Minimum , 

 Average... 



21.40 

 19.56 

 20.44 



The above table shows an average analysis of Paprika made by 

 Doolittle & Odgen. — {Journal Amer. Chem. Soc, Vol. JO, No. g). 



DISCOVERY IN PHOTOGRAPHY. 

 Preservative for Developing Papers and Films. 



Vice-Consul Tarleton B. Taylor writes that a representative of 

 an American photographic company, recently in Bahia, after study- 

 ing the climatic conditions of Brazil, has found a chemical com- 

 position which, when added to the regular developer, counteracts 

 the bad effects which the tropical climate has on photographic 

 papers, plates and films. Mr. Taylor's details follow : 



The representative claims that photographic papers, plates and 

 films that heretofore have been guaranteed for one year only in 

 Brazil can on account of this discovery be safely guaranteed for 

 three years. I have seen him work with developing papers which 

 had been in this climate three to four years and were considered 

 useless by a photographic supply dealer in Bahia, and which, when 

 placed in the regular developing solution, turned black before the 

 picture appeared. When the extra chemicals were added they 

 seemed to retard the oxidation formed under the severe climatic 

 conditions, and brought out the exposed picture as well as if the 

 developing paper had been only six weeks in this climate. 



