CHAPTER VII. 



RECIPES, FORMULAE AND USEFUL HINTS. 



Ammonia carmine. 



Pulverized carmine 15 grains. 



Aqua ammonia (strong) 40 drops. 

 Absolute alcohol I oz. 



Glycerine 2 oz. 



Distilled water 2 oz. 



Put the carmine in a test tube. Pour in the ammonia, boil a few 

 seconds and set the whole aside for a day to allow the superfluous am- 

 monia to evaporate. Add the mixed glycerine and water, then the al- 

 cohol and filter. 

 Borax carmine. 



Pulverized carmine 15 grains. 



Saturated aqueous solution of borax 15 fl. dr. 

 Mix and add absolute alcohol 15 fl. dr. 



Filter and collect the crystals when dry. Dissolve nine grains of the 

 crystals in one ounce of distilled water. 



Picrocarminate of ammonia (Picrocarmine). 



Make a strong solution of carmine in ammonia and water, and a 

 saturated solution of picric acid in water. Mix the acid solution with 

 the carmine until the ammonia is just neutralized. Then filter. 

 Hcematoxylin. 



Rub together in a mortar one part extract of logwood and three parts 

 pulverized alum (by measure) and afterward add enough water to dis- 



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