of a metallic Substance called Palladium. 315 
Subnitrate of platina is composed of, 
The above oxide of platina - 89 
Nitric acid and water - - - 11 
100. 
But, in the reduction of this oxide of platina, it became of a 
green colour; and remained during some time in that state. 
Nitrate of platina sometimes becomes of a pale green at the 
edges, when evaporated to dryness; and ammonia assumes a 
green colour when it holds oxide of platina in solution, as we 
have seen more particularly with palladium. This, therefore, is 
a second oxide of platina. It contains but seven per cent, of 
oxygen, 
I dissolved a known portion of platina in nitro-muriatic acid, 
and expelled the nitric acid, by pouring in a sufficient quantity 
of the muriatic ; and then evaporated to dryness. By this expe- 
riment I learned, that the insoluble muriate of platina is com- 
posed of. 
Yellow oxide of platina - - 70 
Muriatic acid and water - 30 
100. 
I then expelled the muriatic acid by the sulphuric, and eva- 
porated again to dryness. I found the insoluble sulphate of 
platina to be composed of,. 
Oxide of platina - 54,5 
Acid and water ------ 45,5 
100,0. 
By much the most delicate test for platina is muriate of tin. 
A solution of the former, so pale as hardly to be distinguished 
from water, assumes a bright red by a single drop of the recent 
