Citronella oil contains Citronellal (C10H18O), Citronellol and
Geraniol.
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No, it's a word used for a variety of plants. Citronella candles are candles scented with citronella oil, oil from from plants in the Cymbopogon genus (lemongrass).
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One can purchase citronella oil in home and garden stores. One
could purchase citronella oil in places like Home Depot, Lowes,
Walmart, and local garden stores.
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Two or three drops of citronella oil per candle is all that is
needed.
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The scent of the citronella can repel mosquitoes, depending on
concentration. The oil can also be used to smother larvae and
eggs.