The Marshall Retouching Oils can be applied on films, transparencies, prints, negatives, and even computer canvas paper.A wide range of color combinations from soft and subtle to bold and intense can be gainedThe  Marshall Retouching Oils can be used with both photo pencils, and spot-all dyes after they are dried, thus giving an artistic touch to your imagesYou can color glossy prints made using Marshall's pre-Coloring spray with this Cobalt Violet oil color paint