The Winsor & Newton Designers Drawing Ink is a high-quality, professional-grade ink that is perfect for creating beautiful artwork. This 14ml bottle of Ultramarine ink is lightfast and waterproof, making it ideal for use in a variety of mediums, including watercolour, gouache, and acrylic. The ink is also suitable for use with dip pens, brushes, and airbrushes. The ink is highly pigmented, giving it a deep, vibrant colour that will last for years. The ink is also non-clogging, so it won't dry out in the bottle or clog up your pens and brushes. To use, simply shake the bottle before use and apply the ink to your chosen medium. The ink can be used on a variety of surfaces, including paper, canvas, and wood. With its lightfast and waterproof properties, the Winsor & Newton Designers Drawing Ink is the perfect choice for creating beautiful artwork that will last for years.