298 CORROSION, DECALCIFICATION, AND BLEACHING. 



Glycerin . . . . . .1 part. 



80 per cent, alcohol .... 2 parts. 



Mix and add 2 to 3 per cent, of hydrochloric acid. 

 Pigments dissolve in this fluid, and so doing form a stain 

 which suffices in twelve to twenty-four hours for staining the 

 nuclei of the preparation. You may, if you like, first stain 

 the objects with borax-carmine, and then put them into the 

 liquid, the pigment being washed out more rapidly than the 

 carmine. But the progress of the decoloration must be care- 

 fully watched. 



