Medalha comemorativa da descoberta do caminho marítimo para a Índia

Como devo limpar a madalha? A prata ficou negra com o tempo. Algum produto? Obrigado. 

Don’t clean it, don’t rub it, you may damage it.

There are dipping acidic solutions on the market which would remove this, after you rinse in water and pat dry. However you will have removed the toning, this will take years to return. Some people like naturally toning, having a clean silver coin/medal says it has been dipped, some people don’t like this.

Ultimately it depends on what you want, like, are you planning on selling, keeping, etc

Hi

Thank you for the advice. 

Best regards