將各種精油──即由果實(橘子),花(柚子),及草(薄荷草)所得精油──以吸附劑,酸類,鹼類,氧化劑及還原劑脫色時,發現活性碳及過氧化輕具有甚強之脫色作用。
To 10 g of the red-brown essential oil the following chemicals were added separately and allowed to stand at the room temperature for one week, while the containers were shaken several times every day.