APPENDIX. 141 



Uffelmann's Reagent. 



1 per cent solution of carbolic acid in water colored 

 faintly amethyst with a solution of ferric chloride. 



INDICATORS. 



Alizarin. 

 1 grm. dissolved in 100 c.c. of water and filtered. 



Boas' Reagent. 



5 grms. resorcinol and 3 grms. saccharose dissolved in 

 100 c.c. 95 per cent alcohol. 



Congo Red. 



1 grm. dissolved in 90 c.c. of water to which is added 

 10 c.c. of 95 per cent alcohol. 



Dimethylaminoazobenzene. 

 0.05 grm. dissolved in 100 c.c. 95 per cent alcohol. 



Gunzburg's Reagent. 



2 grms. phloroglucinol and 1 grm. vanillin dissolved in 

 100 c.c. 95 per cent alcohol. (Does not keep well.) 



Phenolphthalein. 

 1 grm. dissolved in 100 c.c. 95 per cent alcohol. 



Tropceolin 00. 

 0.05 grm. dissolved in 100 c.c. 50 per cent alcohol. 



