REAGENTS AND STAINS. 211 



Magenta for blood, etc. 



Magenta i gram 



Alcohol (eighty-five per cent). 50 cc. 



Water 150 cc. 



Glycerine 200 cc. 



Meythelene blue for blood 

 Make a saturated aqueous solution. 

 Carter's carmine mass for injecting 



Carmine 3 grams 



Strong ammonia 6 cc. 



Glacial acetic acid 6 cc. 



Coignet's French gelatin ... 7 grams 

 Water 80 cc. 



Process. "Place the finely cut gelatine in 50 cc. of 

 water for five hours ; dissolve the carmine in mortar 

 with a little water and add the ammonia; let stand for 

 two hours and then pour into a bottle, rinsing the mor- 

 tar with the remainder of water ; place the gelatin and 

 water on a water-bath until the gelatin melts. To the 

 carmine fluid add the acetic acid, a few drops at a 

 time (rinsing mortar thoroughly) until the fluid be- 

 comes crimson. To the melted gelatin add the crim- 



