Gold and silver testing acid

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Y

Yef

New member
Joined
Sep 29, 2024
Messages
2
Location
Casablanca
Dear Sir,
Can someone help me for exact formula to make testing acid for gold 18k and 14k.
I tried many times using commercial HNO3 and HCl acids. But in vain.

Thanks in advance.
Yef
 

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