In folklore, witches’ bells are believed to ward off negative energy and evil spirits. Ringing a bell symbolizes evoking good energy and clear thoughts, which is thought to repel evil forces. Sound is also one of the most potent forms of banishing and cleansing.
For this reason, the bell has long been believed to repel evil spirits, and as such, witches’ bells are traditionally hung on doors and other entry points to protect the home from negative influences. Witches’ bells typically include a key, and the cords are black.
Keys are considered symbols of good luck. They symbolize the opening and closing of powers, with the opening representing good powers and the closing representing the dispelling of bad ones. Due to the colour’s association with protection, black nylon cord is often used for witches’ bells.