These bags will protect your jewelry items for up to three years. The copper-colored backing will change color as an alert to change out your bag for a new one. They provide the ultimate anti-tarnish protection for storing and shipping, jewelry, silver, and other precious metals. Will not harm any metals or gemstones. Temperature and humidity independent. The inert material will not release corrosive gases like charcoal based products do.

Safe and effective on all non-ferrous metals such as silver, brass, copper, and bronze as well as ferrous metals (iron based). Non-toxic, recyclable, and environmentally safe.