Two-day workshop. Carborundum aquatint is a painterly intaglio process achieving a wide tonal range without acid, rosin or toxic chemicals usually associated with traditional aquatint. Carborundum grit in various degrees of texture from course to very fine is mixed with acrylic medium and brushed on to either acrylic or mat board plates. When dry, the plate is inked and wiped like a traditional intaglio plate.