This watercolor ink from Daler-Rowney is a pigmented, water-soluble ink with great lightfastness and intermixability. It can be used straight out of the dropper, or diluted to achieve a subtle hue. This ink is formulated with genuine fine art pigments. You can apply it using traditional brushes, airbrushes, technical pens and paint markers. The expressive fluidity of this watercolor ink is perfect for graphic designers, artists, calligraphers, illustrators, hobbyists and decorative artists. Details: Available in multiple colors 1 fl. oz. (29.5 mL) Pigment-based ink Water-soluble Highly pigmented Lightfast Intermixable ink Conforms to ASTM D-4236