Candle jars and containers
Why everyday glassware is not a candle jar.
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Glass made for candles
The NCA says to avoid burning candles in any glass item not made for candles. It says candle glass is made to handle the temperature changes of burning.
There is a standard for it
The NCA lists ASTM F2179, a standard for glass containers made for use as candle containers. It covers annealing and thermal shock.
Do not scratch the glass
The NCA says never to use a knife or sharp object to remove wax from a glass holder. It may scratch or weaken the glass.
Leftover wax
The NCA says leftover wax can help keep a candle from getting too hot.
Sources: National Candle Association, Expert Tips; National Candle Association, Understanding Safety Standards.
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.
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Wax, wick, scent, color.
