This bottle of Butternut Alcohol Ink is designed to refill the Artist Marker, Butternut (sold separately). This bottle contains 30 ml of ink, enough to refill your marker up to 10 times. These refills can also be used for other alcohol ink techniques and splatter techniques. To refill your marker, remove the brush nib with a pair of tweezers by applying gentle pressure and pulling straight out. Position the tip of the refill bottle right above the open barrel of the marker and then fill the marker with eight to 10 drops of ink. Be careful not to overfill. Then simply reinsert the old nib or replace it with a new nib (sold separately). This will help extend the life of your alcohol marker and will help you always get full coverage when using your markers.