Akua Intaglio soy-based permanent inks are a non-toxic, environmentally safe way to do printmaking. Formatted for intaglio, they can also be applied with a brayer for relief, monotype, and collagraph printmaking techniques. - Akua Intaglio Ink - Bone Transparent Black, 237 mlAkua Intaglio Inks, BONE TRNS BLK 237ML -