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Its specific gravity at 15° C. is 0.883-0.885; refractive index at 20° C., 1.4762-1.4770; it is optically inactive, and boils at 218°-225° C. Heliotropin, which possesses the characteristic odour of heliotrope, is prepared artificially from safrol.

Thus, many essential oils and synthetic perfumes cause the soap to darken rapidly on keeping, e.g., clove oil, cassia oil, heliotropin, vanillin.

It has a strong characteristic odour, and occurs, associated with traces of benzoic acid and heliotropin, in the vanilla bean.

Piperonal, an aldehyde closely allied to vanillin, is used in perfumery under the name of heliotropin and is prepared from oil of sassafras and oil of camphor.