Tom Norton Walnut Drawing Ink owes its reputation for supreme quality to its unique formula which uses premium imported pigment. Experience the unique characteristics and beauty of the ink used by the Old Masters without the acidic qualities of the old formula that was made from real walnuts which fades, is highly acidic and damages paper over time. Tom Norton Walnut Drawing Ink is extremely lightfast, intensely pigmented and water-soluble. This ink features outstanding performance with watercolor techniques such as layering to darken tones or adding water for light washes. You can also use a wet brush to lift color and lighten areas of your painting.