Today one of our cutomer come with a complaint to us that the silver
dinner plate which she has purchased from us has some scattered
black spot on it. They have used this plate for the first time and
immediately washed it after dinner. We are manufacturing our dinner
plate in 99% purity. I wants to know what is the reason for this
kind of scattered black dots? Please help me in solving this problem.
Thanks in adbance and Mary X-Mas.