The Truth About Olive Oil Color

We discussed in a previous article the difference between dark green Palestinian olive oil and light yellow 'Arbequina' olive oil, noting that each has its own distinct taste. A common misconception has spread that green olive oil is authentic and high-quality, while yellow oil is adulterated. This claim is baseless; why?

What causes the difference in olive oil color?

First, it's important to understand what is stated in the specifications of the International Olive Council regarding oil color; they state that olive oil color can be "greenish-yellow" or "yellowish-green," meaning there is a natural color spectrum for olive oil.

The color of olive oil is influenced by several factors, including:

• Harvest Time (Ripeness): Olives harvested early in the season (green) produce a dark green oil, while olives harvested late in the season (black/ripe) produce a golden yellow oil, even from the same variety.
• Cultivar Type: Varieties differ in their pigment content; some tend to produce green oil, while others lean towards yellow. Intensively cultivated varieties typically yield yellowish oil, whereas traditionally cultivated varieties tend to produce greenish oil.
• Green Color: Indicates a high chlorophyll content, often having a strong (grassy) flavor and being rich in antioxidants.
• Yellow Color: Indicates increased olive ripeness and lower chlorophyll, usually resulting in a mild or sweet flavor.
• Environmental Factors: Soil and climate conditions affect the concentration of pigments in the fruit, and consequently, the oil's color.

Does Green Color Indicate Quality?

Green color does not always signify higher quality, nor does yellow indicate lower quality. Both (extra virgin) possess high nutritional value, and the choice depends on preferred flavor and use (green for salads, yellow for cooking).

However, some may resort to deception by adding external green pigments to change the oil's color to green (such as adding a percentage of olive leaves during pressing, or adding oil from a second pressing, or adding artificial chlorophyll dye) to satisfy customers who request green-colored olive oil.

The Difference Between Light and Dark Olive Oil

The difference between light and dark olive oil is not related to quality level, but rather to the harvest time of the fruits and the proportion of natural pigments present in them. Light oil is typically extracted from ripe, black olives harvested at the end of the season, while dark oil comes from green olives picked earlier.

Conclusion

Green color does not always mean higher quality, nor does yellow mean lower quality. Both (extra virgin) have high nutritional value, and the choice depends on preferred flavor and use.

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