Holbein Acrylic Ink has a low thin viscosity but provides the same pigment strength as Holbein Heavy Body and Holbein Fluid Acrylics. The wet ink color will not shift in tone once dried and will not clog a 0.1 mm aperture. Use Holbein Acrylic Ink with a brush, airbrush, dip pen, technical, or refillable marker to create bold designs. You can also dilute Holbein Acrylic Ink to achieve the subtle styles, washes, and tones of watercolor painting.