Anti Tarnish 2" X 3" Small Clear Poly Zip-lock Bags Pack of 10

Built-in saturation indicator Copper bag turns darker in colour when it needs to be changed Zip lock fastening for secure and safe storage Suitable to use with precious gemstones Tarnish protection for up to 3 years These anti tarnish 2" x 3" Intercept zip-lock Bags will provide effective tarnish protection for metals such as silver, gold, brass, copper and bronze, as well as ferrous metals. They feature a built-in saturation indicator. The copper colour will turn a dark grey tone when you need to replace the bag. These bags will not harm any metals or gemstones (including opals, emeralds, or pearls), as well as being non-toxic and non-abrasive. The bags can last in use up to 3 years depending on heat and how many times the bags are opened & closed.