390 INDIN. 



isatin, a mixture of sulphur and isatyde is thrown 

 down, and the solution contains sulph isatyde, which is 

 precipitated when the solution is allowed to drop in 

 water. Grayish-yellow, pulverous substance ; becomes 

 soft in hot water, soluble in alcohol, not crystallizable. 



Indin, C 16 H 10 N 2 2 , isomeric with indigo-blue; is 

 formed when sulphisatyde is well mixed with alcohol, 

 and a solution of potassa gradually added; and the 

 mass, when it has become red, washed out with water. 

 Beautiful rose-colored, crystalline powder ; insoluble in 

 water, but slightly soluble in alcohol. It dissolves, 

 when warmed with alcoholic potassa, and, on cooling, 

 indin-potassium^ C 16 H 9 N 2 2 K, is deposited in small black 

 crystals. 



