I was gifted with a bottle of sweet orange oil for diffusing purpose while meditating. I added around 10 to 15 drops to the diffuser and the aroma was simply good and help you relax..Now, How I found out sweet orange oil is pure? The aroma of pure orange essential oil did not linger for a long time because it belongs to light top notes. If your diffuser is ultrasonic like mine the aromatic scent molecules of the oil are diluted and orange oil being extremely volatile the aroma becomes faint after some an hour. Similarly, since the oil is pure, it evaporates quickly when exposed to air.I diluted orange oil with jojoba oil at the ratio of 2 drops to 1 tsp for apply it on my mother's legs and sole. It worked on the cracks and helped retain moisture of skin. Overall the aroma of sweet orange oil is good and pure.