Dr. Ph. Martin's Frisket Mask Level 01 30ml This liquid allows you to create masks in areas where you do not want to apply color. It is easily removed. It is a useful tool for beginners and advanced artists. This latex-based product allows protection of the work surface to provide additional control as the artist works with different media. Specially designed for use on watercolor papers, as well as a variety of other surfaces. Packaged in 1.0 oz (30 ml) glass bottle with dropper. Brand: Dr. Ph. Martin's 30ml