How to brighten copper jewelry:

 1. Wipe with toothpaste or scrub with hot thick rice soup to restore luster. 

 2. To protect the luster of copper jewelry, you can apply a thin layer of nail polish on it. 

 3、 盐和醋混合成清洗剂，用它来擦拭铜首饰，可使历久常新。 

 4. When storing, keep the air dry.

       5. Wipe the silver cloth or wipe the silver strip to wipe off the oxide layer.