Graphix Aqua Inks are naturally transparent with high lightfastness. They are ideal for watercolor techniques with brush or drawing pen. Even when dried, the ink can be dissolved completely with water. Shake vigorously before use. This set contains one each of Graphix Aqua Ink 15mL in dark ultramarine, petrol and reseda. Details: Dark Ultramarine, Petrol and Reseda 0.5 fl. oz. (15 mL) each 3 bottles Shake vigorously before use High level of lightfastness Color is both vibrant and long-lasting