Verdigris
Verdigris
Verdigris (/ˈvɜːrdɪɡriːs/ or /ˈvɜːrdɪɡrɪs/) is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over time.
Etymology
The term "verdigris" comes from the Middle English vertegrez, from the Old French vertegrez, from vert-de-Grèce ("green of Greece"). The name is thought to refer to the green pigment found on statues in Ancient Greece.
Chemical Composition
Verdigris is a combination of copper carbonate and copper chloride. It is usually found in a green state, due to the presence of copper(II) acetate in the compound.
Uses
Historically, verdigris was used as a pigment in paintings and other art forms. It was the most vibrant green pigment available until the 19th century. Today, it is used primarily for its aesthetic qualities, and can be found on weathered copper structures such as the Statue of Liberty.
Related Terms
Health Risks
Verdigris is not considered a safe substance to ingest. It can cause stomach pain, nausea, vomiting, and diarrhea. In severe cases, it can cause a potentially fatal condition called copper poisoning.
External links
- Medical encyclopedia article on Verdigris
- Wikipedia's article - Verdigris
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