“Rubylith” (wikipedia.org/wiki/Rubylith): a layer of clear film with a translucent red lamination on top. You place it over a photo you want to illustrate and “trace” the picture underneath with an X-acto knife and peel away the unwanted red laminate. You end up with black (red) and white (transparent) line art. The fact that it’s cut out lends it a certain rough, handmade quality. Nowadays just done in Photoshop.
Categories: Black and White Illustration