Vanillin, whose chemical name is 3-methoxy-4-hydroxybenzaldehyde, is an organic compound extracted from the vanilla bean of the Rutaceae plant. It is a white to slightly yellow crystal or crystalline powder, slightly sweet, It is soluble in hot water, glycerin and alcohol, but not easily soluble in cold water and vegetable oil. Vanillin has a vanilla bean aroma and a strong milky aroma, which can enhance and fix the fragrance.