The absolute finest-quality, permanent artists pen for art & graphics. Pigmented India Ink is both acid free and archival (pH neutral). Smudge- proof and waterproof when dry, the ink contains the highest quality pigments for unsurpassed lightfastness (resistance to fading). Highly permanent after drying. The brush retains its shape even after constant use. By varying the angle, you can achieve script, fine, medium and broad strokes. Shading of various kinds is possible. Store horizontally.