What's the difference between coppery and cupreous?

Coppery

Definition:

• (a.) Mixed with copper; containing copper, or made of copper; like copper.

Example Sentences:

Cupreous

Definition:

• (a.) Consisting of copper or resembling copper; coppery.

Example Sentences:

• (1) The enzyme activation by cupreous ions is countered by the enzyme inhibition by cupric ions, the rate of inhibition being determined by the level of cupric ions.