Discolouration of silver alloy is due to_____________?
(A) Tarnish
(B) Tarnish and corrosion
(C) Wet corrosion
(D) Dry corrosion
Discolouration of silver alloy is due to_____________?
(A) Tarnish
(B) Tarnish and corrosion
(C) Wet corrosion
(D) Dry corrosion
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