Blue is the colour of the element of water, healing, tranquility, sleep, dreams, and truthfulness, making these dark blue chime candles quite useful in cleansing, healing, and prophetic candle magic.
Candle magic is one of the simplest forms of spell casting in which the caster decides on a goal, visualizes the end result and focuses intent or will to manifest that result. Typically a caster will write down their intent on a piece of paper the same colour as the candle and burn the paper in a fire safe bowl.