Designed for cleaning Liquitex Acrylic ink! from paintbrushes, airbrush parts, technical and dip pens. Use the clear, low-odour formula to rinse your tools after use, before the ink has dried. If the ink has already dried, soak the tool in Pen Cleaner, leave it to work for a few minutes, then test to see if the crusted colour comes off??and then rinse with water. Leave for a little longer if the ink is thick.