The Winsor & Newton Designers Drawing Ink is a high-quality, professional-grade ink that is perfect for creating beautiful artwork. This ink is made with a blend of pigments and dyes that provide intense, vibrant colors that are lightfast and waterproof. The Cobalt color is a deep, rich blue that is perfect for adding a touch of drama to your artwork. The ink comes in a 14ml bottle, which is enough to last for many projects.This ink is suitable for use with a variety of media, including paper, board, and canvas. It can be used with dip pens, brushes, and airbrushes. It is also suitable for use with technical pens and ruling pens. The ink is easy to use and dries quickly, allowing you to create beautiful artwork with ease. It is also non-toxic and safe to use.The Winsor & Newton Designers Drawing Ink is a great choice for professional artists and hobbyists alike. It is a high-quality ink that provides intense, vibrant colors that are lightfast and waterproof. It is easy to use and dries quickly, allowing you to create beautiful artwork with ease.