How To Turn Platinum Jewelry Into PURE PLATINUM Pt2

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How To Turn Platinum Jewelry Into PURE PLATINUM Pt1
https://youtu.be/zwL7hfa1tuc

How To Turn Platinum Jewelry Into PURE PLATINUM Pt3
https://youtu.be/VXqjFKDcI0E

How To Turn Platinum Jewelry Into PURE PLATINUM Pt4
https://youtu.be/l9ku9GTLaF0

How To Turn Platinum Jewelry Into PURE PLATINUM Pt5
https://youtu.be/0Ilw33LeZjk

How To Turn Platinum Jewelry Into PURE PLATINUM Pt6
https://youtu.be/CYqr02lhEvs

How To Turn Platinum Jewelry Into PURE PLATINUM Pt7
https://youtu.be/ldcChDt8_7E

I evaporate the chloroplatinic acid solution down to a syrup to drive off excess nitric acid. Then I rehydrate with hydrochloric acid and filter out any solids. I add a saturated solution of ammonium chloride to the filtered chloroplatinic acid solution to form ammonium hexachloroplatinate precipitate. Then I collect the precipitate in a filter, rinse with ammonium chloride water, then transfer the precipitate to a casserole dish and calcine to 360 degrees C to burn off the ammonium chloride and form platinum sponge.