I have two identical vintage ornate gold frames from the 1930's. Some paint is rubbed off on several of the decorations. The under color is white. I assume gesso. I wish to revive the frames with new gold paint. what color gold do I look for? Do I need to cover the old gold with gesso first? Or can I paint directly over the old gold color? These are not gold leaf frames. Not a shiny gold but a bright gold color. Maybe age has dull it slightly. Thanks for help.