Under no circumstances use a candle which has already adorned a dinner table or been used as a bedroom candle or nightlight. There is a very good occult reason for not using anything but virgin materials in magick. Vibrations picked up by secondhand materials or equipment may disturb your workings and negate their effectiveness. Some magick workers who are artistically inclined prefer to make their own candles for ritual and magickal use. This is a very practical exercise because, not only does it impregnate the candle with your own personal vibrations, but the mere act of making your own candle is magickally potent.
Specialist shops sell candle wax and molds together with wicks, perfumes, and other equipment.
The hot wax is heated until liquid and then poured into a mold through which a suitably-sized wick has already been threaded. The wax is then left to cool. Once this has occurred, the mold is removed, leaving a perfectly-formed candle. Special oil-soluble dyes and perfumes can be added to the wax before the cooling process is complete to provide suitable colors and scents for a particular magickal ritual. Once you have purchased or made your ritual candle, it has to be oiled or 'dressed' before burning.