verdigris

From French vert-de-gris.

• (General American) IPA^(key): /ˈvɝ.də.ɡɹis/, /ˈvɝ.də.ɡɹɪs/

verdigris (countable and uncountable, plural verdigrises)

1. A blue-green patina or rust that forms on copper-containing metals.
   • 1922, Virginia Woolf, Jacob's Room, Vintage Classics, paperback edition, page 13

     Let's to the museum. Cannon-balls, arrow-heads; Roman glass and a forceps green with verdigris.

2. (chemistry, dated) Copper acetate.
3. The colour of this patina or material.

   verdigris colour:  

   • 1735, [John Barrow], “GREENS”, in Dictionarium Polygraphicum: Or, The Whole Body of Arts Regularly Digested. [...], volume I, London: Printed for C[harles] Hitch and C[harles] Davis in Pater-noster Row, and S[amuel] Austen in St. Paul's Church-Yard, OCLC 987025732:

     Gamboge is one of the firſt yellows, which may be made to produce five or six ſorts of Green with verdegreaſe, according as the gambooge is in the greater or leſſer proportion; if it abounds, it will make a tolerable oak green, and being mixt with a greater quantity of verdegreaſe, it will make a fine graſs Green.

• (blue-green copper rust or patina): aerugo
• (copper acetate): Spanish green
• (color): Spanish green

• verdigrisy

verdigris (third-person singular simple present verdigrises, present participle verdigrising, simple past and past participle verdigrised)

1. To cover, or coat, with verdigris.

   An old verdigrised brass bugle. — Hawthorne.

• verdigris on Wikipedia.Wikipedia