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Antique Questions Forum / Re: how can you tell between copper and brass and does copper turn green?
« on: March 04, 2013, 02:58:22 pm »Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates...
And the most common acetic acid that most people had at hand...was pee! I remember an old general contractor foreman on a new church project that was designed with an "aged" sheet copper roof over the nave. After the copper was installed, he would bark out an order to anyone that didn't appear busy enough: "Go up and pi_ _ on the roof!"
Yup, I have read about sculptors instructing their assistants to pee on the completed bronze statues.