HEMATINE. 



129 



taric acid to a slightly acid reaction, filter, and 

 evaporate at 60 C. to one tenth of its bulk. On 

 standing minute crystals of hematine are deposited, and 

 may be purified by washing successively with ether 

 and cold water. 



2. Examine the hematine under the microscope, it 

 will be found to consist of rhombic crystals. 



3. Hematine is insoluble in water, alcohol and ether 

 when neutral, but soluble in water containing caustic 

 alkali, or in acid or alkaline alcohol. 



4. Dissolve some hematine in alcohol and a little 

 sulphuric acid. The spectrum will show four, under 





AaBC D Eb F 



HH' 



Spectrum of four-banded hematine. 



HH' 



AaBC D Eb F 



Spectrum of five-banded hematine, 



certain circumstances five, bands. Render the solution 

 alkaline by caustic potash. The spectrum will show 

 only one broad band. Acid will restore the spectrum. 



9 



