Tsubaki oil(camellia flower oil) is a natural oil used to prevent rust on carbon steel knives, like traditional Japanese blades. Apply tsubaki oil when you’re storing your knives for an extended period(like for a vacation). If you live in a very humid environment, apply the oil on your blades more frequently to combat rust. Use a few drops of oil on your blade and apply evenly, making sure not to miss any spots. Wipe off residue with a soft towel.