If Copic markers are stored vertically, the ink may sink towards the bottom of the marker as the ink amount decreases. For that reason, it is best to store markers horizontally.
If there is plenty of ink in the marker, it doesn’t make much of a difference whether the marker is stored vertically or horizontally. We ship ready-made marker sets with the markers positioned vertically and the Super Brush nib end pointing up.
After opening refill ink, it is best to store it vertically because of the container’s structure.
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