Due to these minor imperfections in the process itself the comics were produced with sharp clean edges defined by hard black and often the layouts would be done so that objects could be painted a single color. These restrictions and a lack of a proper gray constrained the art style to fit within the technology of the day. The methods they used to overcome this came in using either a style much like pointillism (halftone) as the image above or hard solid colors, hatching and crosshatching as below.

Keeping your colors simple was the best way to do this but it restricted character design and forced them to create an inventive way to make the character stand out.