Dry erase markers are typically recommended to be stored with the cap side down. Storing them cap-side down helps to ensure that the ink is evenly distributed in the marker tip and ready for immediate use when you pick it up. This position allows gravity to assist in keeping the ink flowing toward the writing tip, preventing it from drying out or becoming less vibrant.
Storing dry erase markers cap-side down also helps minimize the chance of air entering the marker, which could contribute to the ink drying out. When the cap is securely in place and the marker is stored in a vertical position, the ink tends to be better preserved.
If you find that a dry erase marker has been left uncapped for an extended period or if it seems to have dried out, you can try shaking the marker gently to encourage the ink to flow back into the tip. Additionally, replacing the cap securely and storing the marker cap-side down can help prevent further drying.