Black and White Illustration
Before the internet, if you wanted somebody to see your product or understand your process or know how to operate your machine, you had to print it on paper. Black and white printing was cheap; color? Not so much, so there was a huge demand for black and white illustration. With the web and inexpensive digital printing almost everything is in color now, but a small niche yet remains for monochromatic renderings.
There are several kinds of media seen here but most are either “scratchboard” or “rubylith”. If you want to know more about either of these, go to my Deep Thoughts page.