. - % appendix (continued) spice specific gravity refractive index optical rotation ( ) ( °c) ( °c) ( °c) pepper oil - - star anise - - up to ; sometimes up to ' ajowan oil - . a - up to ' coriander - . a - ' to + ' dill - . a - ' to ' anise oil - -i. up to -l ' fennel seed oil - . a - ' to ' celery...