1864.] 



Mr. Perkin on Mauve or Aniline-Purple, 



173 



alcoholic solution of bichloride of platinum ; from this mixture the new salt 

 separates as a highly crystalline powder. I have generally preferred to use 

 cold solutions in its preparation ; but if moderately hot solutions be em- 

 ployed, the salt will separate as crystals of considerable dimensions. 



This platinum-salt possesses the green lustre of the hydrochlorate, but, 

 on being dried, assumes a more golden colour. It is very sparingly soluble 

 in alcohol. The following numbers were obtained from various preparations 

 dried at 100° C. :— 



I. '44125 grm. of substance gave '072 of platinum. 



II. "4845 grm. of substance gave '079 ,, 



III. '511 grm. of substance gave "083 ,, 



IV. -510 grm. of substance gave '083 „ 



V. -6345 grm. of substance gave -1035 „ 



VI. '618 grm. of substance gave '101 „ 



VII. '31275 grm. of substance gave "60525 of carbonic acid and '118 

 of water. 



VIII. -30675 grm. of substance gave '595 of carb. acid and'1 10 of water. 



IX. '3795 grm. of substance gave "27 of chloride of silver. 



These results correspond to the percentages in the following Table : — 



II. 



III. 



Carbon . 

 Hydrogen 

 Chlorine . 

 Platinum 



16-31 16-3 



16'24 



VII. 



Carbon 52'77 



Hydrogen 4*19 



Chlorine 



Platinum 



IV. 



16'27 



VIII. 

 52-86 

 3'98 



V. 



16-3 



VI. 



16-3 



IX. 



17-6 



The formula, G^^ Hg^ H Pt Clg, requires the following values :— 



Mean of experiment. 



Theory. 



Pt 

 CL 



324- 

 25- 

 56' 

 98-7 



106-5 



610-2 



53-09 

 4-09 

 9-2 



16- 16 



17- 46 



100-00 



52-81 

 4-19 



16- 28 



17- 6 



Gold- salt. — This compound is prepared in a similar manner to the 

 platinum-salt, only substituting chloride of gold for chloride of platinum. 

 It separates as a crystalline precipitate, which, when moist, presents a 

 much less brilliant aspect than the platinum derivative ; it is also more 

 soluble than that salt, and when crystaUized appears to lose a small quan- 

 tity of gold. The following results were obtained from a specimen dried 

 at 100° C. 



