84 Mr. Hatchett’s Experiments on the various Alloys, 
GOLD ALLOYED WITH COPPER. 
Experiment 1. 
Eleven ounces one pennyweight and three grains of gold, 
23 car. 3T. gr. fine, were alloyed with eighteen pennyweights 
and twenty-one grains of the finest Swedish copper. 
The heat employed was only just sufficient to keep the whole 
in fusion ; and, when the alloy appeared to be well mixed, the 
metal was poured into a greased mould of iron. 
The standard gold, thus formed, was perfectly ductile, and 
of a deep yellow colour, inclining to red. 
Experiment 11. 
The bar formed by the preceding experiment was melted in 
the strongest heat which could be excited, and was again cast in 
the mould of iron. 
Not any alteration, however, appeared to have been produced 
by the increased heat. 
Experiment in. 
The bar was again melted, and was then cast in sand ; but 
still the ductility and other properties remained as before. 
From these experiments it appears, that gold made standard 
by copper, does not suffer any change in ductility by the dif- 
ferent degrees of heat, nor by the nature of the moulds in which 
the metal is cast, provided that the copper be pure. 
Experiment iv. 
Eleven ounces one pennyweight and three grains of fine gold, 
le depart j 51110, enfin par la couleur jaune pale, et tirant au blanc, du cornet, quand 
H est recuit. Manuel de VEssayeur, par V a u qu e li n, p. 49, 
