1864] 



Mr. Perkin on Mauve or Aniline-Purple. 



175 



green metallic reflexion. It is more insoluble than the hydrobromate. 

 The products used in the subjoined analysis were recrystaUized three times, 

 and dried at 100° C. 



I. '5115 grm. of substance gave '22575 of iodide of silver. 



II. '248 grm. of substance gave '549 of carb. acid and -10975 of water. 



III. '2985 grm. of substance gave -663 of carb. acid and '1265 of water. 

 IIV. '2765 grm. of substance gave '615 of carb. acid and •1145 of water. 

 Percentage composition : — 



I. II. III. IV. 



Carbon 60-46 60-57 60-65 



Hydrogen 4-9 4-7 4-7 



Iodine 23-8 



The formula, C^^ H I, requires the following values : — 



Theory. Experiment. 













.. 324- 



60-89 



6a-56 



Hgg • • 



. . 25- 



4-69 



4-7 





.. 56- 



10-54 





I 



.. 127-1 



23-88 



23-8 





532-1 



100-00 





Acetate of Mauveine. — This salt is best obtained by dissolving the base 

 in boiling alcohol and acetic acid. On cooling, it will crystallize out ; it 

 should then be recrystaUized once or twice. This acetate is a beautiful 

 salt, possessing the green metallic lustre common to most of the salts of 

 mauveine. Two combustions' of specimens dried at 100° C. gave the fol- 

 lowing numbers : — 



I. -28325 grm. of substance gave -778 of carb. acid and -153 of water. 



II. -29275 grm. of substance gave -806 of carb. acid and -1645 of water. 

 Percentage composition : — 



I. II. 

 Carbon 74-9 75*0 



Hydrogen 6 6-2 

 These numbers lead to the formula 



as shown by the following Table : — 



Theory. Experiment. 











^29 • 



. ..348 



75- 



74-95 





...28 



6- 



6-1 



N. . 



...56 



12-06 





0. . 



. .. 32 



6-94 







464 



100-00 





Carbonate of Mauveine. — The tendency of solutions of mauveine to 

 combine with carbonic acid is rather remarkable. If a quantity of its solu- 



