Probably more than you care to know
http://www.wholehealthmd.com/refshel...23,129,00.html
"Olive Oil Labeling Terms
Extra Light: Olive oil that has been refined to produce a lighter color and flavor. Extra light olive oil is ideal for foods where an olive oil flavor would be intrusive (baking, for example). Extra Light has the same amount of calories and fat content as the other types of olive oil.
Extra Virgin: This is olive oil that is from the first pressing of the olives and has a low acid content and a delicate flavor. It is mechanically produced (pressed, rather than chemically refined), and has an oleic acid level under 1%. Industry standards stipulate that extra virgin olive oil must be free of acidity, expressed as oleic acid of not more than 1 gram per 100 grams (1%). But in addition to this quantitative analysis, olive oil is also put through a more subjective test by a panel of experts who taste and smell the olive oil and then rate it on a 9-point scale: The oil must score 6.5 or higher to receive "extra virgin" designation.
First Cold Press: These olive oils are derived from the first pressing, without heat applied, and are more expensive, and have a full, rich, flavor with much of the original olive's flavor maintained in the oil. Olive oils with "first cold press" on their labels indicate that they are of superior quality due to the fact that at no point in production has heat been used to process the olive oil.
Pure: "Pure" olive oil consists of a blend of virgin olive oil and refined olive oil derived from the chemical extraction of oil from the remaining pulp leftover after cold pressing. These olive oils tend to have little flavor and are best used for sauteing rather than salads.
Refined: Olive oil derived from virgin olive oils by refining methods which do not lead to alterations in the initial structure. Olive oil that is labeled as "Pure" or "Original" or "Light" indicates that the oil has been refined, rather than pressed.
Virgin: Virgin olive oil is mechanically produced, with acidity of between 1% and 3%. Virgin olive oil comes from the second cold pressing of the olives and left over pulp, and few producers in the U.S. market olive oil that isn't virgin. "
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