Bob Colacello Internet on Warhol's silkscreen paintings (not discussed in this catalogue): The outline of the face is traced from blow-up of photo negative onto tissue and then tissue is placed over carbon, which is over raw canvas, and retraced by pressing carbon outline onto canvas. Then Warhol slaps paint (acrylic) on with a large brush, more like housepaint brush than artist's brush, rarely cleaning brush, as he switches from area to area and color to color. He also uses hands, especially fingers, to create texture, gesture, blend colors. he doesn't clean hands much either, so colors merge, appear here and there, disappear rather arbitrarily. After it dries the photo negative is silkscreened (by Alex Heinrici at his own studio) and onto the painted canvas." -- Source of annotation: Marvin or Ruth Sackner.