174 



Mr. Perkin on Mauve or Aniline-Purple, [1864. 



I. '47175 grm. of substance gave '1245 of gold. 



II. '35525 grm. of substance gave '094 of gold. 



III. '309 grm. of substance gave '495 of carbonic acid and '101 of water. 

 Percentage composition : — 



I. II. III. 



43-68 



3-6 



Carbon 

 Hydrogen 

 Gold 



26-3 



26-46 



The formula, C^^ N^, H AuCl^, requires the following percentages : — 



Mean of experiment. 



Theory. 





.. 324 



43-53 



43-68 



H25 . . 



.. 25 



3-34 



3-6 



N, 



.. 56 



7-44 





Au .. 



.. 197 



26-61 



26-38 



CI, .. 



142 



19-08 







744 



100-00 





Hydrohromate of Mauveine. — This salt is prepared in a similar manner 

 to the hydrochlorate, which it very much resembles, except that it is less 

 soluble in alcohol. Analysis of preparations dried at 100° C. gave the 

 following numbers : — 



I. '3935 grm. of substance gave '1515 of bromide of silver. 



II. '450 grm. of substance gave -173 of bromide of silver. 



III. -3265 grm. of substance gave '7^^75 of carb. acid and '158 of water. 



IV. '35125 grm. of substance gave '86075 of carbonic acid and '1675 

 of water. 



Percentage composition : — 

 I. 



Carbon — 



Hydrogen 



Bromine 16-38 



These numbers agree with the formula C^^ H Br, as shown by 



the comparisons in the following Table : — 



II. 



16-37 



III. 

 66-55 

 5-37 



IV. 



66-8 

 5-29 



Theory. 

 



Experiment. 



C27 . . 



.. 324 



66-8 



QQ'Q7 



H,. 



. . 25 



5-15 



5-33 



N, 



.. 56 



11-56 





Br .. 



./ 80 



16-49 



16-37 





"485 



100-00 





Hydriodate of Mauveine. — In preparing this salt from the base, it is 

 necessary to use hydriodic acid which is colourless, otherwise the free 

 iodine will slowly act upon this salt. It crystallizes in prisms having a 



