Avoid exposing Copic markers and refill ink to direct sunlight, and store them in a cool place. Note that if these are left in a location that is exposed to direct sunlight for a long time, ultraviolet light may cause the markers to degrade or crack, the colors to fade, or the cotton inside (ink reservoir) to dry out.
*Ultraviolet light may cause color changes in the refill ink. Copic ink is flammable. Store refill ink away from fire.
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