Tarnish

окисле́ние

okislénije

(oxidation or discoloration, especially of a decorative metal exposed to air)

потускне́ние

potusknénije

(oxidation or discoloration, especially of a decorative metal exposed to air)

де́лать ту́склым

délatʹ túsklym

(to oxidize or discolor due to oxidation)

поро́чить

poróčitʹ

(to compromise, damage, soil, or sully)

пятна́ть

pjatnátʹ

(to compromise, damage, soil, or sully)

тускне́ть

tusknétʹ

(to oxidize or discolor due to oxidation)