The whites are built up using dry pigment - a mix of zinc and titanium white - in an emulsion medium. Once the whites are built up, the darks are worked in.
Working in the darks: This is a transition from the drawing to the painting stage. I continue to use emulsion as the medium with dry pigment. This keeps the underpainting very "lean" and is in keeping with the "fat over lean" addage. The underpainting is considered lean because there is very little oil in the emulsion and none at all in the dry pigments.
|detail from April 13|