This auxiliary trial set gives you tools to prep and prime your canvas like a pro. It includes four mediums: black gesso, transparent gesso, white gesso and acrylic binder. Each is designed to create the perfect base for your artworks. Acrylic Binder 120ml: Primer, acrylic paintmaking, collage gluing. Multi-purpose use. Black Gesso 120ml: Primer, for a perfect base on absorbent surfaces. White Gesso 120ml: Primer, for a perfect base on absorbent surfaces. Transparent Gesso 120ml: Primer, for a perfect base on absorbent surfaces.