They were then colored and textured with a combination of watercolor, gouache and pencil and ink frottage. Frottage is a technique created by Ernst that involves creating rubbings of different textured surfaces like wood and textiles to give the work a three-dimensional appearance.
Colored and textured with watercolor, gouache, and pencil and ink rubbing, they employed a technique created by Ernst called rubbing. This technique creates impressions on various textured materials such as wood and fabrics to give their artwork a three-dimensional appearance.