Candle tunneling, explained
Why wax gets left on the sides of the jar.
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Short burns
The NCA says if a candle is lit only briefly, the wax cannot melt completely. It says to follow the maker's instructions and never burn a candle unattended.
Do not push the wax
The NCA warns that pushing wax down into a hot candle risks skin burns and shortens the exposed wick.
Some leftover wax is normal
The NCA says leftover wax can keep a candle from getting too hot, and room temperature and burn time affect how much is left.
When to stop
The NCA says not to burn candles all the way down. Stop when 1/2 inch of wax remains.
Sources: National Candle Association, Expert Tips; National Candle Association, Candle Safety Tips.
FAQ
General information only. Never leave a burning candle unattended, and keep it at least 12 inches from anything that can burn. When you heat wax, stay with it, and turn off the heat if you leave or see smoke. Never use water on a wax fire. If you can do so safely, slide a lid over the pot and turn off the heat; if the fire does not go out, get everyone out and call 911 from outside. Read and follow the Safety Data Sheet and instructions from the maker of every wax, wick, fragrance oil, and dye you use.
Next: candle soot
Where the smoke comes from.
