Tarnishing

• (p. pr. & vb. n.) of Tarnish
Found on http://thinkexist.com/dictionary/meaning/tarnishing/

Tarnishing

Tarnishing is the formation of a film of discolouration on the exposed face of a metal, destroying the lustre. Some metals are very susceptible to tarnishing, silver being notorious in this respect.
Found on http://www.probertencyclopaedia.com/browse/AT.HTM
No exact match found