For 10 points, name this color which surrounds many Byzantine icons due to hammered sheets of metal.
This color is the background of the face-to-face San Vitale mosaics depicting royal entourages in Ravenna. It surrounds all but the face and arms of a Vienna socialite in a 1907 portrait of Adele Bloch-Bauer. Phidias used this color for the dress of his colossal statue in the Pantheon, and it was used to show Neptune and Ceres facing each other in Benvenuto Cellini's sculpted Salt Cellar. This color of the bracelet in Manet's Olympia dominates amid the dark rectangles making up a man, who hugs the circular forms of a woman, in The Kiss by Gustav Klimt. For 10 points, name this color which surrounds many Byzantine icons due to hammered sheets of metal.
This color is the background of the face-to-face San Vitale mosaics depicting royal entourages in Ravenna.
gold foil [or gold leaf; accept Au; prompt on "yellow" I suppose]