Essential oils may not burn well in candles for several reasons:
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Flash Point: Essential oils have low flash points, which means they can ignite at relatively low temperatures. This can make them more prone to burning off quickly or even catching fire when exposed to a direct flame, such as a candle wick. This can create a safety hazard.
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Volatility: Essential oils are highly volatile compounds, meaning they evaporate easily at room temperature. When you add essential oils to a candle, they can evaporate quickly, reducing their presence in the candle and making it difficult to maintain a consistent fragrance throughout the burning process.
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Uneven Combustion: Essential oils do not mix well with the wax used in candles. The oil and wax have different combustion properties, leading to uneven burning and potentially causing the candle to sputter or produce excessive soot. This not only affects the scent but can also create a mess and reduce the candle's overall quality.
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Sooting: When essential oils are mixed with candle wax and burned, they can contribute to the production of soot, which can blacken the candle container, walls, and ceilings. Soot can also be a health concern when inhaled, as it can contain harmful particulate matter.
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Fragrance Integrity: Essential oils are delicate compounds, and heat can alter their chemical composition, potentially diminishing the desired fragrance. Overheating or burning the oils can result in a less pleasant aroma or even produce an unpleasant smell.
If you want to add essential oils to candles for their therapeutic or aromatic properties, it's important to do so with caution. Use small amounts, choose candles made for essential oil blending, and follow safety guidelines to prevent accidents and maximize the enjoyment of your scented candles.