176 CHAPTER XII. 



up in a mortar with the salts, add the alcohol and acid, heat to boiling-point, 

 leave to 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. 



Since this fluid contains in itself all the necessary salts (see 207), it 

 has over the old one the advantage of giving good results with all classes of 

 objects, with the disadvantage of being less highly alcoholic. 



