Sign materials and colors
Signs may be fabricated of any opaque material that does not have a glossy or reflective surface, except that glossy translucent material may be used:
(a) in areas where the intent is to imitate or replace glass, as in transoms; or
(b) for individual letters in internally lit illuminated signs.
Background colors for signs or common sign boards shall be limited to black, navy blue, dark green, maroon or bronze.