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Olive oil quality is equally dependent on the quality of the olives themselves and on the time they have to wait from harvesting to extraction, in addition to the extraction method itself. The two main agents that cause the degradation of olive oil are oxygen and light. Once an olive is harvested, it should be pressed within 24 hours.
Black olives or ripe olives are picked at full maturity when fully ripe, displaying colours of purple, brown or black. [105] To leach the oleuropein from olives, commercial producers use lye , which neutralizes the bitterness of oleuropein, producing a mild flavour and soft texture characteristic of California black olives sold in cans. [ 105 ]
There are two methods of preparing Kalamata olives, known as the long and short methods. The short method debitters the olives by packing them in water or weak brine, which is changed daily for around a week. Once debittered, they are packed in brine and wine vinegar with a layer of olive oil and slices of lemon.
Kalamata Olives vs. Black Olives Peter Adams/Getty Images When it comes to comparing kalamata olives and black olives, it’s important to note that kalamata olives are indeed a type of black olive.
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These are labeled as "ripe" green olives that have been cured. [11] The process involves lye-curing in an oxygenated solution, that takes approximately 24 hours instead of six to eight weeks, and treatment with ferrous gluconate that fixes the black color. The olives are then placed in cans in mild brine, then pressured and heat processed. [12]
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