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How to Test Gold, Silver and Other Precious Metals. To start, make three test solutions as follows: Bottle #1: Schwerter's Testing Solution - Mix 1 gram of Potassium Dichromate with 22ml of concentrated Nitric acid and 8ml distilled water. Bottle #2: Mix 1 part (by volume) Hydrochloric acid and 50 parts of Nitric acid. Add to 12 parts of distilled water.

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