A man went door to door posing as a goldmith he promised to bring back the glitter of old and dull gold oranments 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?