Fragrance oil

[1] Essential oils, widely used in society, emit numerous volatile organic compounds (VOCs).

[2] Most high quality essential oils are extracted from natural sources such as plants, herbs, and flowers.

[3] Some include (out of a very diverse range): Scented candles are produced when fragrance oils are combined with hot wax like paraffin, forming a homogenous solution.

[citation needed] Fragrance oils are retained like a sponge when the wax is cooled to room temperature.

Lighting the candle wick increases the wax temperature, gradually releasing an aroma through the evaporation of the fragrance oil.