COPIC Various Ink Refill E23 Hazelnut -- 25 ml COPIC ink is an alcohol-based ink that works well with watercolors and coloured pencils. COPIC Original, Sketch, Ciao, and Wide markers are refillable using this fast-drying, permanent and non-toxic ink. To refill the markers, match the color number on the marker with the corresponding ink color number. Markers can be refilled by dabbing the ink directly onto the broad nib using the attached nozzle. This 25 ml ink can refill markers 12+ times or more, depending on marker type and usage. Permanent and non-toxic. Dries acid-free.