Oxidizing (commonly called “tarnish”) can give copper a darker patina, often deliberately done by jewelers to highlight designs in the metal or wirework. Colors can also be applied to copper by flame, acids, inks, etc. Some of these may have a lacquer coating applied to protect the patina. It is best to check with the jeweler if you don't know if it's coated.
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Forest bathing is a thing now. The practice was alive and well in the 80’s, we just called it tree hugging. Bottom line, most folks would benefit from some time just sitting in and absorbing nature in the forest.