Protecting the Consumer and Servicing
the Trade with Independence and Integrity

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 -



Recognising excellence in Hallmarking Awareness

17th May 2022

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Dippal Manchanda to speak at the Santa Fe Symposium®

12th May 2022

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TI SENTO - Milano and Mesmeric Distribution announce hallmarking move to The Birmingham Assay Office

6th Apr 2022

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25th Sep 2018

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City of Wolverhampton wins Touchstone Award 2018

8th Jun 2018

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2nd May 2018

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