Answers

  • QHM
  • Ambitious
2015-05-10T11:31:44+05:30
Because of air and moisture
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2015-05-11T13:07:35+05:30
This is because the silver metal reacts with sulphur present in air and form silver sulphide.thus the layer of sulphur sulphide is formed on the top of the articles make it dull and black.`
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