NEW ALCOHOLIC COCHINEAL. Ill 



cool, leave for some days standing with frequent agitation, 

 filter. 



Use as the old tincture, the objects being prepared and 

 washed out with 50 per cent, alcohol. The stain is like that 

 of paracarmine, but not quite so strong and not so sharp. 

 Mayer only recommends it as a succedaneum of paracarmine. 

 The object for which it was devised has been explained in 

 the last paragraph, where also some limitations to its useful- 

 ness have been indicated. 



For the chemical theory involved in the composition of 

 these tinctures see also the last paragraph, and supra, 146. 



