OCR Text |
Show Pure Copper Pink Color Pure copper Is not exactly copper cop-per colored, but rather a silvery pink. The coppery shade Is the result re-sult of the partial obscuring of this natural color by a thin coating of the darker colored copper oxide. But the colors shown by gold and some of Its alloys, writes Dr. Thomas Thom-as M. Beck, In the Chicago Tribune, are not due to any such oxide film, since gold Is exceedingly reluctant to combine with oxygen. Rather they are due to the actual color of the metal. |