Metals tarnish because the outer surface reacts with oxygen in the air in an oxidation–reduction reaction. Usually, copper reacts to form copper oxide, becoming darker and duller. But if there are other elements in the environment, different compounds are formed.

Copper can react with sulfur in the air from pollutants to form sulfides and sulfates, with saltwater to form chlorides or the sweat on your skin to form chelates. 

In medicine, oxidation reactions can occur between copper and the cell walls of bacteria, which causes them to pop and kill the microbe. This is why some wound dressings contain copper or silver. To continue to wear your jewelry without your skin changing colors, apply clear fingernail polish on your jewelry. Allow to dry fully.

Shipping times within the United States depend on the provider and service level:

• Local deliveries: Deliveries within the same city or area are usually completed in 1-2 business days.

• Regional deliveries: Shipments between states typically take 2-5 business days for standard services.

• Cross-country deliveries: Coast-to-coast shipments generally take 5-7 business days.
  USPS, UPS, and FedEx provide reliable options for local, regional, and national deliveries.

Cross-border shipping times vary based on customs clearance and the shipping provider. Typical estimates include:

• Standard services: These services take 5-12 business days and are suitable for non-urgent deliveries.

• Expedited services: Faster delivery options complete shipments in 3-7 business days.

• Priority services: Premium services ensure delivery within 1-3 business days, depending on the provider.
  Customs clearance and import/export regulations can significantly impact cross-border shipping times.

No. Maybe one day in the near future there will be one. Who knows?

Absolutely! I make large purchases through a legit business. Fret Not. I’ve got the real stuff.