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
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor