cupreous

The cupreous precipitate must be triturated with lime, after it is nearly dry, to bring out the fine velvety blue colour.

Copper was named after Venus, and cupreous salts were known as venereal salts.

These crystals are merely some of the cupreous salt forced over by the heat.

Finally they must be winced through dilute sulphuric acid to clear up the white, by removing the cupreous tinge.