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fame that standard gold contains of alloy. The 
mixture was uniform, of a tolerable golden colour, 
but eafily diftinguifhable from that of ftandard gold 
by a dingy bell-metal call. It worked well, was 
forged into a thin plate without cracking, and drawn 
into moderately fine wire. 
5. Twenty- two carats and a half of gold, and 
one and a half of platina (= 15 : 1), melted into an 
uniform mafs, which, after the ufual nealing and 
boiling, proved fomewhat tougher than the pre- 
ceding, and of a better colour. 
6. Twenty- three carats of gold were melted with 
one of platina ; which is nearly half the proportion, 
that ftandard gold contains of alloy. The compound 
worked extremely well, but was diftinguifhable from 
gold by a manifeft dinginefs, which it retained after 
repeated forgings, fulions, nealings, and boilings. 
7. Twenty-three carats and one-fourth of gold, 
and three-fourths of a carat of platina (=31 : 1), 
formed an equal mixture, very malleable, dudtile 
like the three foregoing whilft hot as well as cold, 
but not intirely free from their peculiar dingy colour. 
8. A mixture of twenty-three carats and a half 
of gold, with half a carat of platina (=47 : 1 ), was 
very foftand flexible, of a good colour, without any 
thing of the difagreeable caft, by which all the fore- 
going compofitions were readily diftinguifhable, in 
the mafs as well as on the touchftone, from fine or 
ftandard gold. 
9. A mixture of twenty-three carats and three- 
fourths of gold, with one-fourth of a carat of platina 
(=95 : 1), could not be diftinguifhed by the eye or 
hammer from the fine gold itfelf. 
In 
