Oil of guaiac is a fragrance ingredient used in soap and perfumery.
[1] Oil of guaiac is produced through steam distillation of a mixture of wood and sawdust from palo santo.
Once melted, it can be cooled back to room temperature yet remain liquid for a long time.
[2] Oil of guaiac is primarily composed of 42–72% guaiol, bulnesol, δ-bulnesene, β-bulnesene, α-guaiene, guaioxide and β-patchoulene.
It is considered non-irritating, non-sensitizing, and non-phototoxic to human skin.