Disclosed herein is a method of detecting a downhole washout. The approach involves applying an image to a substrate, determining a color of the image, and exposing the image to ultraviolet light to form a curing indication image. Each of the plurality of test pads is in electrical communication with a respective one of the bond pads. Later, according to the sample clock signals, sample output signals to generate a plurality of sampled signal. In addition, methods of and compositions for generating and using these polypeptides and libraries are provided.