Consolidating platinum

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These pebbles could not be melted alone but would alloy with and adulterate gold to the extent that the gold bars would become brittle and impossible to refine.

The pebbles became known as —that is, granules of silvery material from the Pinto River, a tributary of the San Juan River in the Chocó region of Colombia.

The palladium, which remained in solution when the platinum was precipitated, is now precipitated by the addition of ammonia.

After the palladium salts are recovered by filtration, they are redissolved and reprecipitated to form a pure salt, and this is converted to metallic form, usually by chemical reduction with formic acid.

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The platinum is precipitated from solution with ammonium chloride, and the resulting crude platinum salt is recovered by filtration and then heated to decompose it to a powdered metallic form.

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