There are three basic grades of edible olive oil, and several types within each grade. Extra virgin includes "premium extra virgin" and "extra virgin"; virgin comprises "fine virgin," "virgin," and "semifine virgin"; and olive oil includes what used to be called "pure olive oil" and "refined oil."
All types of extra-virgin and virgin oils are made from the first pressing of the olives, which removes about 90 percent of the olives' juice. Chemicals and high heat are not allowed in the production of extra-virgin or virgin oils -- no further processing or refining occurs after the pressing process. Neither extra-virgin nor virgin oils are allowed to contain any refined olive oil.
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