There are fragrance oils, but they won't evaporate cleanly. That is, they leave residue behind.

Try some EO and see. Any one should work, if it's really an EO.
3b/c, CG 9/18/08
Last process: 04/05/08 Big Chop: 08/08/09
Currently: Herbal Essences Hello Hydration, Herbal Essences Set Me Up gel (summer only), Boots Curl Creme (winter only)