What Is Candle Tunneling?
When a candle burns straight down and leaves hard wax around the outside, this is called candle tunneling. This will waste your wax and prevent your candle from achieving its maximum burn time and scent.
How Do I Prevent It?
Your first burn is the most important, it sets the “memory ring” for how your candle will burn. On your first burn, it is important to ensure that the pool of melted wax reaches the edges of your candle before snuffing the flame.
When the wax pool reaches the edge on its first burn, it resets the candles memory and allows the wax to re-open to the full width of the candle.
I Have It, How Do I Fix It?
Use a hair dryer, on high heat, to blast the top of a candle until the top layer of wax has melted and is smooth; this will help the candle reset its memory.
There is also the Foil Method. Fold a piece of aluminum foil in half, wrap it around the candle, then fold it up and over the flame like a tent, the candle will need to breathe, therefore leave a hole on top open for oxygen. Keep the foil on for about 15 to 30 minutes, depending on the size of your candle and depth of your tunnel. All of the wax from the sides should melt off.
If your candle is really bad, a candle warmer could become your best friend. It can allow for you to melt the wax and release the aroma without a flame.