66 Mr. Hatchett’s Experiments on the various Alloys, 
the mixture of manganese, in this precipitate, does not appear to 
diminish, or in any way affect, the fulminating property of the 
gold. 
GOLD ALLOYED WITH BISMUTH. 
Experiment i. 
To eighteen pennyweights and ten grains of gold, 23 car. 
3-§- grs. fine, when in perfect fusion, were added one penny- 
weight and fourteen grains of pure bismuth. 
The external colour of the metal was pale greenish yellow, 
like that of bad brass. 
It immediately broke under the hammer, and shewed a fine- 
grained earthy fracture. 
Experiment 11. 
Eighteen pennyweights and ten grains of the fine gold, were 
alloyed with one pennyweight and six grains of copper, after 
which, eight grains of bismuth were added. 
The ingot appeared, externally, of a pale brownish yellow ; 
it was very brittle, and the fracture was like that of the former, 
excepting that the grain was not so fine. 
Experiment in. 
Eighteen pennyweights and ten grains of fine gold, were 
alloyed with one pennyweight and ten grains of copper, and 
four grains of bismuth were then added, to complete the 
standard proportion of alloy. 
This metal was, in colour, like gold made standard by cop- 
per ; it was very brittle, but the grain was coarse. 
