(/pəˈtin.ə/)
Noun
1. A gloss or superficial layer.
2. Of a green colour, tinted with grey, like that of bronze patina.
3. The color or incrustation which age and wear give to (mainly metallic) objects; especially, the green rust which covers works of art such as ancient bronzes, coins and medals.
…During the site’s earliest days, the support of Huffington’s friends had supplied a patina of credibility to the fledgling organization. (It was national news, for instance, when the late Nora Ephron agreed to lead a vertical dedicated to divorce.) But as the Huffington Post grew, Huffington’s friendships became an increasing source of concern and potential conflicts in the newsroom.
From the post: Arianna Huffington’s ineffective management style may have led to her departure from the Huffington Post
Source: How Arianna Huffington Lost Her Newsroom (vanityfair.com)