| | | | | | Photo Gallery 1 | | | |  |  |  | | | | A dominant silver cockatiel can be either a single-factor (it has only one copy of the affected gene) or a double-factor (it has two copies). Double-factors are lighter than single-factors, just as if they had a double dose of melanin reduction. Both types have dark eyes, beaks and feet, and a dark grey "skullcap". |
| | 
This mutation is dominant to all other colors, including grey. "Single factor" means this one has one whiteface and one pastelface mutation. All these birds will look the same. There is no known way to visually differentiate between a pastelface that is split to whiteface and one that is not. | |
