388 CARBOLIC ACID. 



The ammonia salt has been used medicinally in cases of ague 

 with success. 



Aurine, or, Rosolic Acid. 



Prepared by heating carbolic, oxalic, and sulphuric acids 

 together in certain proportions. A dark mass is thus obtained 

 which is washed freely with hot water till all excess of acid 

 is removed, and then dried. 



It is used for dyeing silk and also in calico printing. 



The calcium lakes of aurine are used largely by paper stainers- 

 Stdplio- Carholates. 



When sulphuric acid is mixed with carbolic acid, a definite 

 compound, called sulpho-carbolic acid, C6HgS04 is formed, freely 

 soluble in water, and capable of forming definite salts with 

 various oxides. 



The most important of these salts is the sulpho-carbolate of 

 soda, which is recommended for internal administration in cases 

 of scarlet fever, and also as a preventive when epidemics prevail. 



