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In page Pulp magazine:

"

Later pulps began to feature interior illustrations, depicting elements of the stories. The drawings were printed in black ink on the same cream-colored paper used for the text, and had to use specific techniques to avoid blotting on the coarse texture of the cheap pulp. Thus, fine lines and heavy detail were usually not an option. Shading was by crosshatching or pointillism, and even that had to be limited and coarse. Usually the art was black lines on the paper's background, but Finlay and a few others did some work that was primarily white lines against large dark areas.[citation needed]