Aquarellum is a collection of watercolor painting kits that use masking vellum paper in an innovative and exclusive technique that creates beautiful, vibrant paintings. Using this technique, paint only adheres to unmasked areas of the image board. With just a few drops of paint, each brush stroke reveals the image, which may be painted over as many time as needed to obtain the desired artistic result. It’s magic! Aquarellum Phospho kits utilize glow-in-the-dark vellum paper, so masked surfaces will shine brightly in the dark!