When Harald Siepermann started out as a professional artists he usually worked with a blue or red color pencil for the rough sketches, and finalized the drawing with a grey pencil. Harald actually didn’t do inking. At that time the final inking of his drawing was done by Hans Bacher, especially for all the work that had to be done for Alfred J. Kwak.
In the early 1990’s Harald Siepermann started to practice more with inking, and created a series of drawings on A3 size paper based on some of his famous characters. Here and there you’ll find some Tipp-Ex to erase some errors (it was the pre-Photoshop era). But, he quickly made that skill his own, and further throughout his career he would do the inking himself. Here are some of these drawings.