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A man went door to door posing as a gold...

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

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the goldsmith dipped the set of the gold bangles in aqua regia solution. Aqua regia is a freshly prepared mixture of 1 part of conc. `HNO_3` and 3 parts of conc. HCl by volume . Aqua regia dissolved a considerable amount of gold from the dipped gold bangles and hence reduced their weight drastically. The dishonest goldsmith can recover the dissolved gold from aqua regia by a suitable treatment.
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