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verdigris (noun) greenish blue coating appearing on cotton or brass.
Verdigris is the greenish blue coating that sometimes appears on copper or brass, exposed too long to weather. Copper and brass articles have greenish blue coating when exposed to weather and not cleaned for sometime. This coating is verdigris.
- Having been too long in the lumber room, the copper vessels had a thick coat of verdigris on them. Their outsides looked mostly greenish blue because of the verdigris.
- Having long been neglected, the copper bust statue of the leader had a thick coating of verdigris on it. It took a lot of lime to clean it of the verdigris.