(a) In addition to horizontal muntin bars, separation bars or equivalent, any of the following methods may be used to alert persons to the presence of transparent glass doors and fixed adjacent transparent glass sidelights in their path of movement:

1. (1) chemical etching
2. (2) sandblasting
3. (3) adhesive strips not less than one and one-half inches in vertical dimension extending across at least two-thirds of the total glazedarea
4. (4) decals
5. (5) paint, gilding or other opaque marking materials
6. (6) opaque door pulls or push bars extending across at least two-thirds of the total width of the glazed area