The 180ml bottles from Daler-Rowney  contain permanent, pigmented acrylic ink in Process Yellow. FW Artists Ink are acrylic based pigmented water resistant inks featuring high degree light fast, fully intermixable colours. Ideal for use by artists in the production of pictures for permanent display. All FW Inks are acrylic based, pigmented, water-resistant artists\' inks with a high degree of lightfastness and intermixability. The Ink can be used straight out of the dropper, or diluted to achieve the most subtle of tones. As Daler-Rowney inks are pigment based they are strong and rugged and work well through airbrushes and technical pens. - Process Yellow - Daler-Rowney - Pigment-based inks. - High lightfastness. - Fully intermixable colours. - Can be diluted to watercolours, watersoluble and water-resistant. - Usable with airbrush and technical pens. - Made in England.