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This waterproof, pigment-based carbon ink is highly regarded by artists, and is a standard for ink-washing and mixed media work where you need to draw a line that will later be washed overtop.
Caution: Pigmented inks are intended for use in fountain pens, though they require more diligent maintenance and should not be left to dry out in a pen. It is best to clean it from your pen at least once a week to prevent clogging. Certain pens may handle pigmented inks better than others.