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It's winter cold and flu season and the perfect time to formulate some candle and soap projects with eucalyptus essential oil. It contributes a wonderful green top note that lends itself to essential oil blends that have been used to treat respiratory ailments for centuries. But here's a suggestion - don't just think of it as an essential oil to clear up congestion. Just a little bit of eucalyptus added to other essential oil blends or even to traditional fragrance oils can give them a complexity and brightness that is really nice.