12 



DECALCIFYING FLUIDS. 



(iii.) HYDROCHLORIC ACID. 



1 to 10 p. c. in water of the strong acid (sp. gr. 1-16.) 

 Softens rapidly, but causes tissues to swell and become almost 

 structureless. This is remedied by the addition of Alcohol 

 as in the following : 



(iv.) EBNER'S SOLUTION. 



90 p. c. Alcohol, 1000 cc. ; Water, 200 cc. ; Chloride of 

 Sodium, 5 grms. ; Hydrochloric Acid (sp. gr. 1'16), 5 cc. 



In this solution the Spirit and Salt are added to prevent the 

 swelling of the tissue. This solution takes a long time to 

 soften, its action being very gradual, requiring about six 

 weeks. To each volume of the tissue 200 to 300 vols. of the 

 solution must be used ; when softening large bones it is neces- 

 sary to add a small quantity of Hydrochloric Acid from day 

 to day, to replace that which combines with the Lime Salts, 

 and examine the tissue with a needle from time to time, till 

 the process of softening is complete ; the tissue is then 

 washed in a large volume of Water to remove the acid, and 

 finally kept in 70 p. c. Alcohol. 



(v.) HYDROCHLORIC ACID AND GLYCERINE. 



Glycerine, 95 ; Hydrochloric Acid, 5. 



This is especially useful for softening teeth ; it softens and 

 yet does not in any way interfere with the structure or bony 

 appearance ; it also acts as a preservative. Its action is slow, 

 taking several weeks. 



(vi.) NITRIC ACID. 



Aqueous or Alcoholic solution containing from 1 p. c. for 

 small bones, up to 5 p. c. for large heavy bones. 



They are first placed in 90 p. c. Alcohol for two or three 



