Pillar candles are tall, wide, and generally round. They last a long time, so they are excellent for ongoing spells. The way that pillar candles burn varies according to shape, content, and manufacture, but they generally burn down the center. This creates a growing ring of wax around the wick.
You may find it necessary with some pillar candles to trim or pour off their wax after you extinguish them, in order to keep their wicks exposed.
The longevity of some pillar candles can be increased by gently pushing the ring of wax inward, while it is warm and malleable so that the excess wax will be remelted. With time and practice, you will develop a personal method for working with pillar candles.
Many witches feel that to blow out a candle is to extinguish its magick, or to undo the spell. If you feel this way, you should use a candle snuffer for these spells.