Even a bronze platter is harder than one made of pure copper.

The lady had excellent manners and nerves of pure copper.

All of the impurities fall to the bottom, while the pure copper is made at the negative electrode.

When he discovered a rich vein of almost pure copper, by a deep lake, it reminded him of the book.

This process has been successfully used to cut both pure iron and pure copper.

It then coats the thin sheet of pure copper.

It was cast from pure copper using the lost-wax process.

The veins were almost completely pure copper, with trace amounts of silver and gold.

These coins were made of pure copper, which is very soft.

Although they were pure copper, removing the masses took a great deal of effort, and was sometimes not even profitable.