Dr. Ph. Martin's White Ink 1.0 oz  Perfect for fine writing. It offers the same brilliance and permanence as traditional watercolors but is much more versatile and easy to use. It also adheres to a variety of surfaces such as acetate. The color is incredibly opaque and can cover the dye and color of the marker. Non-waterproof ink. Perfect for 0.25mm nibs Comes in a 1.0 oz (30 ml) glass bottle with dropper. Designed for use with technical pens and airbrushes. Brand: Dr. Ph. Martin's