How to avoid candle tunnelling?
Candle companies go to great lengths to test for different candle problems that customers can encounter. Candle tunnelling is one such issue, which can happen to any type of candle, no matter how much they have cost you. So what is tunnelling and how can you prevent candle tunnelling? Tunnelling is where you get a thick wide layer of wax around the edge of the vessel and the centre is the only part that burns. Its pretty ugly and annoying but its not all down to the candle