For opaque labeling, decoration, and design on almost all light and dark surfaces such as paper, cardboard, plastic, metal, glass, ceramics, wood, and stone. Permanent, low-odor water-based acrylic ink. Excellent smudge and water resistance on nearly all surfaces. Quick-drying, lightfast, and weatherproof. High color brilliance. The valve system allows for a consistent ink flow and a clean, precise application. Colors can be mixed and watercolored before drying.