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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 ]
High-acid canned foods (tomatoes, fruits) will keep their best quality for 12 to 18 months; low-acid canned foods (meats, vegetables) for 2 to 5 years. [5] "Sell by date" is a less ambiguous term for what is often referred to as an "expiration date". Most food is still edible after the expiration date. [6]
Use prior to the expiration date does not guarantee the safety of a food or drug, and a product is not necessarily dangerous or ineffective after the expiration date. [4] According to the United States Department of Agriculture, "High-acid canned foods (e.g. tomatoes and fruits) will keep their best quality for 12 to 18 months. Whereas, low ...
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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]
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.