This photo of the first shawl, still on the loom, shows off a couple of features of this cloth. First, the meandering zigzag is much more clear on a larger piece of cloth. Second, the shininess of the mercerized cotton really shows. The warp and weft are roughly the same color in this photo. Because the warp is so shiny and angled away from the flash, it looks grey. The weft is reflecting the flash and looks white.
In real life, the shininess doesn't have such an extreme effect after the cloth has been washed. It is definitely there, however, and lends another level of luxuriousness, complexity and interest to the cloth.