定義

• Vapor Finish.  A very rarely used method of coloring metal by vapor gas. The object is placed in a sealed container, air removed and the vapor emitted for the required time.
  The vapor is cleared and container opened. It their book on patinas, Hughes and Rowe gave only one vapor formula, tested on three compositions.

  excerpted with permission from

  An Encyclopedia of Coin and Medal Technology

  For Artists, Makers, Collectors and Curators

  COMPILED AND WRITTEN BY D. WAYNE JOHNSON

  Roger W. Burdette, Editor

人际关系