Authenticity Test Kit for Scrap Gold 10K 14K 18K Personal Acid Coin/Jewelry Testing Set
All solutions are ordered fresh and shipped fresh.  The process is simple: scratch or rub your gold sample (e.g., jewelry, coin) onto the testing stone. A soft scratch will leave a sample residue you can test.  --Apply a small drop of the acid purity you estimate your sample to be onto your sample reside.--If the acid dissolves the metal it's less then the karats on the bottle and you should try again with lower level acid.If it dissolves the metal slowly, it's possible your sample is slightly less pure than was suspected.  If the sample reside remains unaltered, it is consistent with the purity of the test acid you used.