- Discolour - Discolour by changing the original varnish - Lose lustre - Lose lustre, discolour - Stain (reputation) - To soil, or change the appearance of, especially by an
alternation induced by the air, or by dust, or the like; to diminish,
dull, or destroy the luster of; to sully; as, to tarnish a metal; to
tarnish gilding; to tarnish the purity of color. - To lose luster; to become dull; as, gilding will
tarnish in a foul air.