These anti-tarnish bags protect your precious jewelry from tarnish. They are zip-closed, see-through copper-color plastic bag from Intercept®. These bags are non-toxic, environmentally friendly, and fully recyclable--containing no charcoals, oils or volatile chemicals. They are made of 100% virgin low-density polyethylene (LDPE) that is specially treated to resist tarnish. The copper color of the bag is a indicator; when it darkens to black, replace the bag with a new one.