Permanent Black Liquid Ink Is resistant to Chlorides and Acids Once dry, water resistant for anything that needs markings Excellent for Outlines, Drawings, and Fabric Measurements Avoid Using with Fountain Pens Avoid using heat or irons. Use with Dip, Pipette, and Brushes German-made, vintage, 10-milliliter calligraphy pens that shake or stir vigorously