Black, opaque, matte, ground acrylic. Works well as a primer on ,most surfaces: Including canvas, wood, paper, metal, chipboard, fabric, plastic, etc. Dries quickly. Works well for variety of color products providing smooth, non â€“ yellowing chalky background. Gesso is water â€“ based. But permanent and flexible after drying. Apply with paintbrush or palette knife. Non-toxic. Archival Safe.