A fine point drawing and writing pen offering a waterproof quick-drying pigment ink. This black Micron pen will not clog or dry out unlike most technical pens. Pigma Micron will not feather or bleed through even the thinnest papers and is smear-proof once it has dried. The pigment in the ink remains colorful and will not ''spread" when applied. Fadeproof against sunlight or UV light. Pigma ink is permanent and washable on cotton fabrics. Tips for using on fabric: Heat set after drying overnight test on a scrap of fabric for washability.