After waiting less than a minute, the inks could be washed without a trace of bleeding. Available in five earthy colors, the pigment-based inks are waterproof, which is still relatively rare among bristle brush pens. Akashiya Sai ThinLine Brush Pens ($4.95 each or set of 5/$14.25) are, by far, the thinnest brush pens I have ever used.
