Glass Novena Candles, tall ones like these, actually traditionally known as “7 Day Candles”.
They actually vary considerably in burn time and are more accurately called Glass Novena Candles. In many different spiritual practices, they are focal points in spell work and you dress them with oils and herbs.
The size of each candle may vary a bit and so one might be slightly shorter or wider than another.
Please observe fire safety at all times and do not leave candles burning unattended. Keep children and pets away from them and place them away from flammable materials.
Have a fire extinguisher on hand and if you need to have them out of sight, there’s a trick you might try. Take a fireproof bin, line it with wet sand and then push the candle down into the sand. That way, if one breaks, the wax will go into the sand and that will help prevent fires.
How To Use 7 Day Candles will teach you lots of way with your candles, to juice up spells.
Glass Novena Candles – Use
Take a piece of clean paper and write out your petition and then place it underneath your candle. Get a dab of a conjure oil on your finger and dress the wax on the top of the candle.
Sprinkle a very small pinch of herbs over that but around the edge, away from the wick. Trim the wick to about a half inch in length and that way, it won’t burn too hot.
Say your prayer/spell with your power hand (writing hand) over the top and the other holding the candle. Knock the candle three times on your altar and then light it.
That’s the shortest description for using these and there are many tips in the linked Free Magick Lesson.