TESTS 1505 



TABLE OF TESTS.— Continued. 



TESTS 



Name. 



Use. 



Reagents. 



Reaction. 



Application. 



Remarks. 



Xanthin. 



Xanthin bodies. 



(a) Freshly prepared Pink or purplish- 

 chlorin-water. (,b) i red color. 

 Nitric acid, (c) Am- I 

 monia-vapor. 



Warm substance with 

 a and trace b as long 

 as gas is evolved ; 

 then evaporate to 

 dryness and bring 

 in contact with c. 



(a) Chlorin-water. (*) Dark -pink or Dissolve in the warm Reaction obtained 



Ammonia, (c) Potass. purple; violet in a; evaporate on ' with xanthin, 



or sodium hydrate. on final addition water-bath; treat heteroxanthin, 



of c. under bell- jar with b. paraxanthin, and 



