Pure copper is red-orange in color. When it is exposed to air it darkens to a brown color and if exposed to air and water, it becomes a blue-green color called verdigris.
Pure elemental sulfur is found near hot springs/pools and volcanic areas, most notably in countries around the Pacific Ring of Fire such as Indonesia, Chile, and Japan where these deposits are often mined.
Sulfur is non-toxic in its pure element form and in the sulphate form. But its compounds such as carbon disulphide, hydrogen sulphide and sulfur dioxide are all toxic.
