Resistant to tarnishing; preventing oxidation or discoloration of metals, especially silver.
From anti- (against) + tarnish (from Old French ternir 'to dull,' possibly from Frankish *tarnjan). This term became common in the 20th century with the rise of specialty coatings and polishes.
Antitarnish coatings work by creating a barrier that blocks oxygen from reaching the metal—it's the same principle used in vacuum-sealed food storage, showing how protection is often just controlled isolation from the environment.
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