resilver
verb
re·sil·ver (ˌ)rē-ˈsil-vər 
resilvered; resilvering
transitive verb
: to silver (something) again or anew : to re-cover (something) with a thin layer of silver or something that looks like silver
resilver an old mirror
had the antique tray resilvered
Word History
First Known Use
1832, in the meaning defined above