It initially are processed the same way as extra virgin – but they undergo additional processing to remove any chemical or sensory flaws that would otherwise make the oil unfit for sale.
High temperatures or chemicals are used in the process, and the it is made odorless, colorless, and tasteless. It typically are blended with a small portion of Extra Virgin Olive Oil to provide some flavor, aroma and color.
Refining is a more intricate process using acids, alkalis, steam and other agents
Below is a closer look at the various steps involved in the refining process, depending on what elements the refiner wants to “clean out.”