MICROCHEMISTK Y. 113 



Its behavior with ammonia, which gives it a splendid blue 

 color, is especially characteristic of thelephoric acid ; while 

 caustic potash and soda produce a more bluish-green color. 

 Thelephoric acid is also, according to Zopf, insoluble in 

 water, ether, chloroform, petroleum-ether, carbon bisul- 

 phide, and benzol, but is pretty readily dissolved by warm 

 alcohol. Concentrated sulphuric or hydrochloric acid neither 

 changes the color nor dissolves the solid pigment ; but con- 

 centrated acetic acid dissolves it with a rose-red or wine-red 

 color, nitric acid with a yellow color, and dilute chromic acid 

 with a dark chrome-yellow color. 



ft. Xanthotrametin. 



195. Zopf calls by the name xanthotrametin a red pig- 

 ment which is deposited on the membranes of Trametes 

 cinnabarina in the form of granular brick-red incrustations. 

 This dissolves in concentrated nitric acidvr\\\i a deep orange- 

 red color, in hydrochloric acid with an orange-yellow, and 

 then more reddish, shade, in sulphuric acid with a rose-red 

 color, and in glacial acetic acid with a yellow color. Dilute 

 sulphuric acid dissolves it with an at first orange-yellow 

 color which then becomes redder. 



Xanthotrametin is dissolved by ammonia and sodium car- 

 bonate with a yellow color, by dilute caustic soda and lime- 

 water with a yellow color, becoming paler, and by dilute 

 caustic potash with a yellow color which quickly passes into 

 reddish. In ferric chloride it is insoluble. 



y. Pigment of A g a r i c u s a r m t 'I la t u s . 



196. This forms, according to Bachmann (II, 7), crystal- 

 line cinnabar-red slivers or lamellae which are insoluble in 

 alcohol and ether, but dissolve in an aqueous or alcoholic 

 solution of caustic potash with a red-violet color which soon 

 goes over into dark yellow. 



<5. Pigment of Paxillus atrot omento sus . 



197. Thorner (I) has extracted a pigment from the above- 

 named fungus which is deposited in crystalline form upon 



