Copic Various Ink N0 Neutral Gray No.0 : Copic Various Ink refills allow you to refill your Copic marker. With a refill you can fill up to 7 times a Copic Wide, 9 times a Copic Marker, 13 times a Copic Sketch and 17 times a Copic Ciao. Copic Various Ink ink contains no risk of allergy. The double graduation on each drying allows you to fill your felt with precision. You can also fill the Touch Twin Twin marker, which works according to the same principle, or even use it on the piceau or the airbrush.