... , inhibit spoilage,inhibit allergy,and oxidation. Natural 4-Ethycatechol is a kind of top-class spice.It can increase fragrance, inhibit ... flavor of wood’s fragrance, spice,and vanillin.Guaiacol is a precursor to various flavorants such as eugenol and vanillin.Its ... , antiseptic, and local anesthetic. It also can be used as a dye in chemical reactions, as oxygen will turn guaiacol from colorless ...