tarnish

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tarnish

Surface discoloration or reduced luster of metals owing to the effect of corrosive substances or galvanic action. In dental restorations, such action may be enhanced by accumulation of bacterial plaque.

tarnish,

n 1. surface discoloration or loss of luster by metals. Under oral conditions, it often results from hard and soft deposits.
2. a chemical process by which a metal surface is discolored or its luster destroyed.