Gold-Copper alloy is called "Naak" (นาก) in Thai. 
The composition may varied, higher quality "Naak" may contain up to 60% gold. 
I 'm not sure if silver always included. 
 
By tradition, the material used by wealthy peasant class as Gold metal is reserved for royal class and silver is for lord/high rank officer or other similar classes. The tradition was, however, faded out around C19.
		 
		
		
		
		
		
		
		
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