When creating the accompanying weights, the challenge was to balance the contrast and stem weight with the serifs. To provide a comprehensive family, Licko wanted the boldest weight to be quite heavy. This meant that the “Black” weight would need more contrast than the Book weight in order to avoid clogging up. But harmonizing the serifs proved difficult. The initial serif treatments she tried didn't stand up to the robust character of the Black weight. Several months passed without much progress, and then one evening she attended a talk by Alastair Johnston on his book “Alphabets to Order,” a survey of nineteenth century type specimens. Johnston pointed out that slab serifs (also known as “Egyptians”) are really more of a variation on sans serifs than on serif designs. In other words, slab serif type is more akin to sans-serif type with serifs added on than it is to a version of serif type. This sparked the idea that the solution to her serif problem for Fairplex Black might be a slab serif treatment. After all, the Book weight already shared features of sans-serif types.

Shortly after this came the idea to angle the serifs. This was suggested by her husband, and was probably conjured up from his years of subconscious assimilation of the S. F. Giants logo while watching baseball, and reinforced by a similar serif treatment in John Downer’s recent Council typeface design. The angled serifs added visual interest to the otherwise austere slab serifs.

The intermediate weights were then derived by interpolating the Book and Black, with the exception of several characters, such as the “n,” which required specially designed features to avoid collisions of serifs, and to yield a pleasing weight balance. A range of weights was interpolated before deciding on the Medium and Bold weights.