234 COLOTTEING MATTERS IK WIFE. 



(brown) being thereby implicated. Everything, 

 therefore, which Faure has said about the colouring 

 matters of wine is proved to be incorrect. 



Batilliat, in his "Traite sur les Vins de la France, 11 * 

 also gives two colouring matters in red wine, rosit and 

 purpurit. The first is rose-coloured, soluble in water 

 and alcohol, but not in ether, and cannot be precipitated 

 out of water by gelatine or albumen : it is principally 

 found in the sediment of young wine. The second is 

 blackish dark red, of astringent taste, soluble in water 

 and ether, but not in alcohol ; soluble in sulphuric 

 acid, and may be precipitated out of it by water. 

 Mixed with gelatine it gives a precipitate insoluble in 

 alcohol and water, which may be found in the deposit 

 of old wines. Faure and Batilliat differ as to the 

 solubility of the two substances in alcohol and water, 

 or ether. Rosit gives a coal which is hardly com- 

 bustible, and leaves a small amount of alkaline ashes. 

 Batilliat never obtained it quite pure. It dissolves in 

 concentrated sulphuric acid, and is precipitable with 

 gelatine. It was obtained from the first sediment of 

 wine when extracted with alcohol, filtered and evapo- 

 rated, and the residue treated with water in which 

 the rosit, and not the purpurit was found, dissolved. 

 The watery solution is freed from tannic acid by 

 gelatine, and evaporated. 



No pure substance can, however, be obtained in 

 this manner, Batilliat would have obtained nothing 



* P. 73, 1848. 



