Acrylic-based inks are water-soluble when wet but dry to a water-resistant film on most surfaces. All colors are very to extremely lightfast. The best means of applying pearlescent colors is by using a dipper pen ruling pen or brush. Due to large pigment particles these are not suitable for fine line nozzles for airbrushes technical pens or fountain pens. All colors are intermixable permanent and translucent with shimmering pearlescent effects. Use on paper board wood and leather. 1 oz bottles. Sky blue.