| Clue | Source | Date |
|---|---|---|
| Metal coatings | New York Times | 02 Jun 2024 |
| They're often examined on ''Antiques Roadshow'' | Newsday | 22 Jun 2019 |
| Antique dealer's concerns | Newsday | 01 Apr 2018 |
| Copper coatings | Universal | 17 Mar 2018 |
| Green films | ||
| Films, of a sort | ||
| Old films | ||
| Bronze coatings | ||
| Bronze coatings | ||
| Copper discolorations | ||
| Old green coats? | ||
| Green films | ||
| Coatings | ||
| Veneers | ||
| Metallic films | ||
| Antique surfaces. | ||
| Films | ||
| Films on bronze. |