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pigment particles in a liquid suspension) tend to clog the narrow passages of the pen. India ink, a carbon pigment-based ink, also contains a binder, gum arabic, which can quickly clog such pens. Some pigmented inks do exist for fountain pens, but these nanoparticle inks use pigments that are very finely ground to reduce the chance of clogging. They have the advantage of being waterproof and are used by artists who want to draw lines that will not be affected by a watercolour

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