tarnishable

transitive verb

1. to dull the luster of or discolor the surface of (a metal) as by exposure to air
2. 1. to besmirch or sully (a reputation, honor, etc.)
   2. to spoil, mar, or debase: to tarnish a memory

intransitive verb

1. to lose luster; grow dull; discolor, as from oxidation
2. to become sullied, soiled, spoiled, marred, etc.

noun

1. the condition of being tarnished; dullness
2. the film of discoloration on the surface of tarnished metal
3. a stain; blemish