Izink inks are acrylic based and acid-free. They combine the qualities of water-based inks and alcohol inks: UV-resistant, water-dilutable, opaque and compatible with all substrates (for smooth surfaces and to ensure better adhesion, it is advisable to dilute color with alcohol). The bottle comes with a dropper. it is possible to spray these inks by diluting the color with water or by mixing to create custom colors. To obtain finer drops, it is advisable to dilute the color with alcohol.Dropper can be cleaned with warm water to ensure even distribution. Slow drying (about 3 minutes or more if smooth surface).WatercolourMix colours for a custom palette50% water, 50% alchoholSize: 15 ml