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Tiny black dots on silver dinner plate

Today I received a complaint from a customer that the dinner plate which she bought from me and used for first time has scattered black spot on it whch can't be easily removable at hoeme and needs a professional claning. Even thogh we make our hollow-ware in 99% purity and takes every care in handling still we recd.such complaint. I request you all to kindly tell me reason for this black spots and also solution for preventing such things in future.
Thanks in advance