How to tell if it's really Extra Virgin? To start off, let's make one thing perfectly clear--light or extra light olive oil is just that--clear and light in color. It doesn't refer to calories. It refers to lack of color--and flavor. Extra virgin oil should be a strong color and flavor, and often has an opaque appearance. (See "cloudy olive oil" later in this article).

This is because to be labeled Extra Virgin, an oil needs to be from the very first pressing. There are a lot of particulates that are in the first pressing that impart loads of flavor into the oil. Even when filtered, the micro-particles remain in Extra Virgin imparting more flavor.

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Fonte: L'italo-Americano