Here is an example of a traditional gold leaf doctors office window sign. The gold was applied on the back of the glass, known as reverse glass, and lettered entirely in reverse. Traditionally, Doctors and Lawyers almost always had this style of gilded or gold leaf signage on their office doors and windows as it is not only the most visible form of window signage, but also because it displayed prestige and a professional appearance. The mirror like finish is achieved by using the age old technique of water gilding with 23 Karat gold leaf. The black shade on the lettering adds a little weight and pronouncement to the letters.