In Greek superstition salt is considered to have great powers as a purifying force. In such, it can be used to ward off demons and evil spirits by throwing it over your left shoulder. Similarly a new house can be purified by sprinkling it with salt to remove any demons or lurking evil spirits.
Salt can also be used to remove an unwanted guest, or a guest that has overstayed their welcome from your house. To remove an unwanted guest, salt can either be sprinkled on the chair of the unwanted guest, or thrown behind them. It is said that if the guest sees you throw the salt the power of the salt is weakened, and is not as effective. Watch out if they see you!
In some areas of Greece, another superstition tied to salt is that it should be covered in the darkness of the night. If the moon or the stars shine upon it, it is believed that the carrier of the salt will develop warts or a rash on their body. Salt and the darkness of the night do not interact well with one and other, as a result of this it is believed a rash will occur on the salt holder’s body.