250 HISTORY OF PRUSSIATES. 



With the simple prussiate it gives a white precipitate, that 

 turns to a fine yellow. This precipitate is a true prussiate 

 of gold, and does not fulminate by exposure to heat. Dis- 

 tilled in a retort it gives out water, empyreumatic oil pretty 

 abundantly, and gaseous oxide of carbon that burns with a 

 blue flame. The residuum is gold mixed with powdered 

 charcoal. I find no mention of ammonia in my notes, whe- 

 ther it were forgotten I do not know. 

 Molybdic acid. Molybdic acid has no effect on either of the prussiates. 

 Tungstic oxide Neither has oxide of tungsten. 



Titanium. Titanium, with the triple prussiate, afforded prussian blue, 



in consequence of the iron retained by the oxide. 



With the simple prussiate it gave yellow oxide of iron, 

 such as this prussiate produces with solutions of red oxide. 

 I have never yet been able to obtain titanium perfectly free 

 from iron. 



Uranium gave a blood red precipitate with the triple prus- 

 siate. With the simple, a yellow white. 



Cobalt gave a grass green precipitate with the triple prus- 

 siate. With the simple, a light cinnamon. 



Nickel gave a greenish white precipitate with the triple 

 prussiate. With the simple, a yellowish white. 



Manganese gave a peach blossom precipitate with the tri- 

 ple prussiate. With the simple, a dirty yellow. 



Copper gave a fine crimson with the triple prussiate. With 

 the simple, a yellow. > 



White muriate of copper, or that in which the oxide is at 

 a minimum, dissolved in muriatic acid, gives with the tri- 

 ple prussiate a white precipitate, but tinged with a little 

 crimson. It appears, that the precipitate would be white, 

 if the muriate were completely free from oxide at a maxi- 

 mum : but the solution of this muriate is like that of iron, 

 it is difficult to keep it at a minimum of oxidation, in conse- 

 quence of the action of the air. 



With the simple prussiate this muriate gave a perfectly 

 white curdy precipitate. A few drops of solution of pot- 

 ash took from it its prussic acid, and turned it yellow, which 

 is the colour of oxide of copper at a minimum. 

 Platina. Platina afforded nothing with either of the prussiates : but 



I find a memorandum, to examine it again. 



Prussiate 



Uranium. 

 Cobalt. 



Nickel. 



Manganese. 

 Copper. 



Muriate of 

 copper. 



