Learn English – Why verdigris and not rust

etymologyword-choice

My son asked me about the discoloration on our outside brass doorknob, and I told him that it was verdigris, explaining that it was basically rust that formed on brass, bronze and copper.

I know what it is and its origin (Old French "vere grez" "green of Greece") but I had no answer when he asked why we don't just call it rust.

Any ideas? One of the definitions of rust is:

any film or coating on metal caused by oxidation

so it would seem to be a correct term to use, but I have no idea why it is not used(at least in my experience) when referring to oxidation of copper.

Best Answer

Verdigris and Rust are both oxidation, but it depends on the metal which is oxidizing. (as user110518 stated)

verde = (latin) green

gris = (latin) grey (also at black) [ty @all]

rust = (old english) red

https://en.wiktionary.org/wiki/griseus

https://en.oxforddictionaries.com/definition/verdigris

https://www.merriam-webster.com/dictionary/rust

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