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Sturdy plastic bottle maximizes safety and allow the user to easily squeeze out one drop at a time. The process is simple: scratch or rub the metal (jewelry) onto a testing stone. Place half a drop of acid onto the part of the stone you used to scratch the sample. If the acid dissolves the metal, it's less than 10K, and you should try again with lower level acid. If it dissolves the metal slowly, it's possible you would have just slightly less than 10K. If the metal remains unaffected, your sample is most likely 10K gold.

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