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Tarnishing can be a big problem for precious metal alloys, particularly sterling silver and low carat golds. Dippal Manchanda MSc CSci CChem FRSC, technical director of the Birmingham Assay Office, explains the problem and offers some solutions. Many jewellers have sought advice about tarnishing from the Birmingham Assay Office – a problem which soon alters the colour, brightness and appearance of the jewellery, eventually rendering it unwearable. In response, the Laboratory team has carried out research which has subsequently been applied to develop tests to determine susceptibility to tarnishing, particularly in relation to packaging materials. What causes tarnishing? Tarnishing of silver, which is typically a blue/ purple/black colour, is triggered by.... To read more about what causes tarnishing and what can be done to prevent it happening make sure to visit our meet the experts page on The Laboratory's website -http://www.theassayoffice.co.uk/meet_the_experts/tarnishing_labexpert.html

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