Want your candle to last longer with minimal soot? Make sure you trim the extra carbon build up on your wick before every single new burn wick trimmers are perfect for this!
During the burning process, carbon builds up on the wicks. This is a normal process, however if you re-light a wick that has this carbon build up it can cause excess soot and heat. This yields a lower quality candle performance. If you have ever noticed black smoke sticking to the sides of your glass candles in the past, this is why!
So just make sure to trim your wicks to 1/4" when you notice this carbon build up on the wicks!